P134016PC00 Title: SARS-CoV-2 binding polypeptide FIELD OF THE INVENTION The invention is in the field of medical treatment and relates to a method for treating α- and β-coronavirus infections in animals and humans, including the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS- CoV-2). In particular, the present invention relates to methods for prophylactic and/or therapeutic treatment of SARS-CoV-2 by means of intranasal administration and/or oral inhalation of interfering polypeptides against SARS-CoV-2. BACKGROUND OF THE INVENTION The SARS-CoV-2 virus causes the disease Covid-19 in humans and is widespread having a significant impact on human society. We should expect the SARS-CoV-2 virus and its variants of concern to continue to cause severe disease and death. In recent years, other coronaviruses have been involved in several major pandemics, causing even more fatalities. As scientists develop therapeutic antibodies and vaccines against SARS-CoV-2, the danger remains of future novel coronaviruses emerging. These emerging and novel coronaviruses can lead to further pandemics. It remains vitally important to identify broadly protective therapies that can combat current and emerging coronaviruses in the future. In addition to SARS-CoV-2, six other coronaviruses are known to cause human disease: the alphacoronaviruses HCoV-229E (human coronavirus 229E) and HCoV-NL63 (human coronavirus NL63), as well as the betacoronaviruses HCoV-OC43 (human coronavirus OC43), HCoV-HKU1 (human coronavirus HKU1), SARS-CoV (severe acute respiratory syndrome coronavirus) and MERS-CoV (Middle East respiratory syndrome coronavirus). Recently, three betacoronaviruses crossed from animals to humans, including SARS-CoV-2 causing serious outbreaks. As of October 2022, the ongoing COVID-19 pandemic caused by SARS-CoV-2, has resulted in more than 6.6 million worldwide deaths since 2019. Furthermore, two coronaviruses previously linked only to animal infection were recently detected in humans who presented with flu-like symptoms. Coronaviruses derive their name from their crown-like appearance. Coronaviruses are a large group of viruses that have spike proteins on their surface, resembling crown-like thorns. The protection afforded by current COVID-19 vaccines arises from therapeutic monoclonal antibodies (mAbs) that target the receptor binding domain (RBD) present on these spike proteins. Structure of the spike protein Coronavirus infection is a multistep process that involves enzymatic cleavage and rearrangement of the surface spike protein. The spike protein has an S1 subunit that binds host cell receptors and an S2 subunit that fuses the viral and cell membranes thereby facilitating cell entry. The viral spike protein of SARS-CoV-2 facilitates viral entry by binding to the angiotensin-converting enzyme 2 (ACE2) receptor on human cells. The SARS-CoV-2 spike contains two cleavage sites: a furin cleavage site at the boundary of the S1 and S2 subunits, and an S2’ site that is conserved in coronaviruses. S1 subunit The SARS-CoV-2 spike protein uses the RBD on the S1 subunit to engage the target cell’s ACE2 receptor. The S1 subunit is more accessible and remains the main target of many neutralizing antibodies. The S1 subunit, however, is more genetically variable than the S2 subunit. When subjected to the selective pressure from antibodies, this propensity towards genetic variability can lead to viral variants with the predominant changes occurring on the S1 subunit. Despite many variants, this broad array in variability is still able to effect receptor binding. S2 subunit The viral spike components essential to infection also involve the structurally complex S2 subunit. The S2 subunit contains dynamic elements essential for fusion with the host cell. Once the receptor has bound, the S1 subunit is discarded and the membrane enzyme transmembrane serine protease 2 (TMPRSS2) or endosomal cathepsins cleave the S2 site. This cleaving leads to insertion of the fusion peptide into the cell membrane culminating in viral fusion. It is understandable that given the very precise sequence of events required by the S2 element, these S2 subunit elements are less disposed towards genetic variability than the RBD, which so far has been capable of retaining or even increasing binding capabilities to ACE2 despite a variety of mutations. The S2 domain sites yield poorly accessible targets for novel therapeutics to protect against a wider range of coronaviruses. The Helix The stem helix at the base of the viral spike protein is even more difficult to access than elements on the S2 subunit but historically benefits from better- preserved amino acid sequencing. The host’s defences The antibodies that our body produces in response to an injected vaccine operates in the bloodstream and only comes into play once the virus starts to attack our circulatory system. The nasal vaccine interacts with a completely different part of our immune system. The nasal passages have their own defence mechanisms that are not triggered through an injection of the coronavirus vaccine, and do not interface well with antibodies in our blood. This means that when the coronavirus starts to colonize our nasal passages we have no defences. Treatments The most common treatment method for individuals suffering from SARS- CoV-2 infections is symptomatic treatment. Limited options for the viral treatment of SARS-CoV-2 exist in the form of small molecule antiviral drugs. Thus, there is a need for different treatments, especially for treatments that are able to target a multitude of SARS-CoV-2 variants of concern at once such as broad-neutralizing antibodies (bnAbs). Although treatment of SARS-CoV-2 infection with one, two or more antibodies is a possibility, a treatment comprising a single polypeptide or combination of polypeptides would be considerably more cost-efficient. It remains vitally important to identify broadly protective therapies that can combat novel coronaviruses. We have surprisingly developed a novel array of broadly protective polypeptides which are disclosed herein. SUMMARY OF THE INVENTION Benefits Unlike the prior art which disclose antibodies and polypeptides that bind to the S1 subunit, the interfering polypeptides disclosed herein bind to and disrupt the functioning of the stem helix bundle thereby inhibiting membrane fusion of the SARS-CoV-2 virion with the target cell. Furthermore, directing these interfering polypeptides at the stem helix bundle allows for broader variant coverage than would otherwise be achieved when targeting the S1 subunit. Without wishing to be bound by theory, it is postulated that the interfering polypeptides disclosed herein bind to the hydrophobic core of the stem helix bundle and disrupts its quaternary structure. The interfering polypeptides disclosed herein bind to and disrupt the functioning of the stem helix bundle and inhibit membrane fusion. The interfering polypeptides disclosed herein bind in a manner that likely prevents the S2 subunit refolding from the pre- to the post-fusion state and thereby blocks viral entry. The interfering polypeptides disclosed herein also allow for the addition of a broader array of formulation strategies to be used. The use of interfering polypeptides directed at the stem helix bundle have higher affinity for their targets than antibodies, permitting lower doses as compared to antibodies to be used. The employment of longer peptides, for example longer than 5, 10, 15, 16, 17, 18, 19 or 20 amino acids can better illicit their effect. The use of interfering polypeptides as disclosed herein negates the need for glycosylation during their synthesis. The use of interfering polypeptides as disclosed herein are smaller than antibodies and, unlike antibodies and some larger polypeptides, do not require conformational changes. Finally, the interfering polypeptides as disclosed herein are significantly easier and cheaper to produce than antibodies. Specific embodiments In a preferred embodiment, we disclose an improved series of polypeptides as described in SEQ ID NOS: 001 to 193. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 001 to 014. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 015 to 025. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 026 to 040. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 041 to 051. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 052 to 057. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 058 to 072. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 073 to 087. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 088 to 102. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 103 to 115. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 116 to 130. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 131 to 145. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 146 to 155. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 156 to 167. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 168 to 178. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 179 to 193. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 009 to 014, SEQ ID NOS: 035 to 040, SEQ ID NOS: 048 to 051, SEQ ID NOS: 082 to 087, SEQ ID NOS: 110 to 115, SEQ ID NOS: 125 to 130 and SEQ ID NOS: 188 to 193. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to any one of SEQ ID NOS: 035, 036, 082, 083 or 0127. A preferred embodiment comprises a polypeptide comprising an amino acid sequence according to SEQ ID NO: 082. A preferred embodiment comprises a polypeptide consisting of an amino acid sequence according to any one of SEQ ID NOS: 001 to 014. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 015 to 025. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 026 to 040. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 041 to 051. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 052 to 057. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 058 to 072. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 073 to 087. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 088 to 102. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 103 to 115. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 116 to 130. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 131 to 145. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 146 to 155. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 156 to 167. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 168 to 178. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 179 to 193. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 009 to 014, SEQ ID NOS: 035 to 040, SEQ ID NOS: 048 to 051, SEQ ID NOS: 082 to 087, SEQ ID NOS: 110 to 115, SEQ ID NOS: 125 to 130 and SEQ ID NOS: 188 to 193. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to any one of SEQ ID NOS: 035, 036, 082, 083 or 0127. A preferred embodiment comprises a polypeptide consisting of amino acid sequence according to SEQ ID NO: 082. A preferred embodiment comprises a polypeptide as disclosed herein, wherein the amino acid sequence has at least 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or at least 99% sequence identity. A preferred embodiment comprises a polypeptide as disclosed herein, for use in a method for treatment of a betacoronavirus infection, preferably a SARS-CoV-2 virus infection or variants of the SARS-CoV-2 virus in an individual, wherein the peptide is administered intranasally and/or by oral inhalation. A preferred embodiment comprises a polypeptide as disclosed herein, wherein the method for treatment of SARS-CoV-2 virus infection is a method for prophylactic and/or therapeutic treatment of SARS-CoV-2 virus infection. A preferred embodiment comprises a polypeptide as disclosed herein, wherein the polypeptide comprises at most any one of 1, 2 or 3 amino acid insertions, deletions or substitutions. A preferred embodiment comprises a polypeptide as disclosed herein, wherein the polypeptide is administered intranasally. A preferred embodiment comprises a polypeptide as disclosed herein, wherein between 0.01 µg and 20 mg of the polypeptide is administered to an individual. A preferred embodiment comprises a polypeptide as disclosed herein, wherein the polypeptide is administered at least once or at least twice per day, preferably wherein the polypeptide is administered at least once or at least twice per week. A preferred embodiment comprises a composition formulated for intranasal administration or oral inhalation comprising a polypeptide according to any other embodiment, in a single dose unit of between 0.01 µg and 20 mg. A preferred embodiment comprises a composition wherein said polypeptide according to any other embodiment, is carried by a Lipid Nano-Particle (LNP), a liposome, or a virus-like particle (VLP). A preferred embodiment comprises a nucleic acid molecule encoding a polypeptide according to any other embodiment disclosed herein. A preferred embodiment comprises an expression vector comprising the nucleic acid molecule encoding a polypeptide according to any other embodiment disclosed herein. A preferred embodiment comprises a host cell comprising the nucleic acid molecule encoding a polypeptide according to any other embodiment disclosed herein, or the expression vector comprising the nucleic acid molecule encoding a polypeptide according to any embodiment disclosed herein. A preferred embodiment comprises a method of preparing a polypeptide, comprising: a) introducing an expression vector into the host cells; b) culturing the host cells in a culture medium, optionally comprising Isopropyl β-D-1-thiogalactopyranoside (IPTG) under conditions allowing the expression of the polypeptide in said host cells; c) lysing the host cells; d) separating the lysed cells, optionally into an insoluble fraction and a soluble fraction; e) solubilizing the lysed cells, optionally into an insoluble fraction using an extraction buffer, optionally comprising a chaotrophic agent and a reducing agent; and optionally f) dialyzing the solution obtained in step (e) in the presence of arginine at concentrations from 0.5M to 2M, preferably from 0.6M to 1.5M, preferably from 0.7M to 1M, thereby obtaining isolated polypeptides. A preferred embodiment comprises a composition comprising a polypeptide as disclosed herein for use in a method of prevention or treatment of a β- coronavirus infection, such as SARS-CoV-2 S protein. A preferred embodiment comprises a polypeptide as disclosed herein that binds to an epitope in the viral envelope spike protein (S) of a β-coronavirus, such as SARS-CoV-2. A preferred embodiment comprises a polypeptide as disclosed herein that binds to an epitope that is outside the RBD of a β-coronavirus, such as SARS-CoV-2 S protein. A preferred embodiment comprises a polypeptide as disclosed herein that neutralizes a β-coronavirus, such as SARS-CoV-2. A preferred embodiment comprises a polypeptide as disclosed herein that inhibits viral and cell membrane fusion. A preferred embodiment comprises a polypeptide as disclosed herein that binds to the S1 subunit of a β-coronavirus, such as SARS-CoV-2 S protein. A preferred embodiment comprises a polypeptide as disclosed herein that binds to the S2 subunit of a β-coronavirus, such as SARS-CoV-2 S protein. A preferred embodiment comprises a polypeptide as disclosed herein that binds to the stem helix at the base of the viral spike protein of a β- coronavirus, such as SARS-CoV-2. A preferred embodiment comprises a polypeptide as disclosed herein that also binds to the S protein of at least two β-coronaviruses, such as SARS- CoV-1 and SARS-CoV-2. A preferred embodiment comprises a polypeptide as disclosed herein that also binds to the stem helix at the base of the viral spike protein of at least two β-coronaviruses, such as SARS-CoV-1 and SARS-CoV-2. A preferred embodiment comprises a polypeptide as disclosed herein that exhibits broad β-coronavirus neutralization by a stem helix–specific binding. In a preferred embodiment, the isolated interfering polypeptides disclosed herein, binds to α- and β-coronaviruses with a KD value of about 100 nM or lower, preferably about 10 nM or lower, preferably about 1 nM or lower, preferably about 100 pM or lower, preferably about 10 pM or lower, preferably about 1 pM or lower, preferably about 0.1 pM or lower. In a preferred embodiment, the isolated interfering polypeptides disclosed herein, binds to an α-coronavirus with a KD value of about 100 nM or lower, preferably about 10 nM or lower, preferably about 1 nM or lower, preferably about 100 pM or lower, preferably about 10 pM or lower, preferably about 1 pM or lower, preferably about 0.1 pM or lower. In a preferred embodiment, the isolated interfering polypeptides disclosed herein, binds to a β-coronavirus with a KD value of about 100 nM or lower, preferably about 10 nM or lower, preferably about 1 nM or lower, preferably about 100 pM or lower, preferably about 10 pM or lower, preferably about 1 pM or lower, preferably about 0.1 pM or lower. In a preferred embodiment, the isolated interfering polypeptides disclosed herein, binds to SARS-CoV-2 with a KD value of about 100 nM or lower, preferably about 10 nM or lower, preferably about 1 nM or lower, preferably about 100 pM or lower, preferably about 10 pM or lower, preferably about 1 pM or lower, preferably about 0.1 pM or lower. In a preferred embodiment, the isolated interfering polypeptides disclosed herein, binds to MERS-CoV with a KD value of about 100 nM or lower, preferably about 10 nM or lower, preferably about 1 nM or lower, preferably about 100 pM or lower, preferably about 10 pM or lower, preferably about 1 pM or lower, preferably about 0.1 pM or lower. In a preferred embodiment, the interfering polypeptides as disclosed herein may be delivered to any mucosal environment. Specific mucosal environments include the nasal epithelium, the oropharyngeal epithelium, the digestive tract, the corneal epithelium or the pulmonary epithelium. In a preferred embodiment, the interfering polypeptides as disclosed herein may be delivered to a combination of any of the epithelia mentioned immediately above. In a preferred embodiment, the interfering polypeptides as disclosed herein may be delivered to the nasal cavity. In a preferred embodiment, the interfering polypeptides as disclosed herein may be delivered to the pulmonary epithelium. In a preferred embodiment, the interfering polypeptides as disclosed herein may be delivered to the corneal epithelium. In a preferred embodiment, the interfering polypeptides as disclosed herein may be delivered to the nasal cavity, pulmonary epithelium and corneal epithelium. The interfering polypeptides as disclosed herein are useful for the treatment of SARS-CoV-2 virus infection in an individual. Preferably, the method for treatment of SARS-CoV-2 virus infection is a method for prophylactic and/or therapeutic treatment of a SARS-CoV-2 virus infection. In some embodiments, an interfering polypeptide is provided to an individual infected with SARS-CoV-2 virus. Preferably, the interfering polypeptide is provided to the individual prophylactically. Preferably, the interfering polypeptide is provided to the individual prior to SARS-CoV-2 virus infection. In a preferred embodiment, the disclosure provides a method of treating SARS-CoV-2 virus infection in an individual, said method comprising administering intranasally or by oral inhalation to an individual in need thereof, a polypeptide that comprise anyone of the polypeptides described in SEQ ID NOS: 001 to 193. In some embodiments, the disclosure provides the polypeptide as disclosed herein for use in the manufacture of a medicament for use in treating SARS- CoV-2 virus infection. Preferably, between 0.01 µg and 20 mg of the polypeptide is administered. Preferably, between 0.05 µg and 15 mg of the polypeptide is administered. Preferably, between 0.10 µg and 10 mg of the polypeptide is administered. Preferably, the polypeptide is administered at least once or at least twice daily. Preferably, the polypeptide is administered daily. Preferably, the polypeptide is administered at least once or at least twice weekly. Preferably, the polypeptide is administered at least once or at least twice monthly. DETAILED DESCRIPTION OF THE INVENTION Definitions The term ‘prophylactic treatment’, as used herein, includes reference to a treatment for preventing infection of an individual with a SARS-CoV-2 virus. Prevention of an infection is preferably performed by administration of a polypeptide as disclosed herein prior to SARS-CoV-2 virus exposure. ‘Prophylactically’ therefore preferably means prior to virus exposure. Nonetheless, it may involve limited invasion of the body by the virus, after which the virus does not, or not significantly, replicate. In a treatment method of the invention, prophylactic treatment involves administration of a polypeptide against SARS-CoV-2 virus at a point in time when the individual is not infected with a SARS-CoV-2 virus. Preferably, said polypeptide binds to the spike of a virion, more preferably a conserved epitope of the polypeptide protein of a virion. In some embodiments, an individual in need thereof is not (yet) infected with SARS-CoV-2 virus. The term ‘therapeutic treatment’, as used herein, includes reference to treatment of a viral infection (including SARS-CoV-2 disease) after viral infection has taken place. A viral infection involves the entry of the body by the virus, and the spreading of the virus to locations in the body other than the location of entry and/or the replication of the virus in the body. A viral infection may cause one or more disease, but may also be latent, in other words may reside in the body without causing a disease. The term ‘SARS-CoV-2 virus infection’, as used herein, includes reference to the pathological or non-pathological, preferably pathological, entrance and residence of a SARS-CoV-2 virus of any type in a human host. The infecting virus may replicate within the host, its cells, or the cells of its microbiome. The infecting virus may or may not cause a disease, such as Covid-19. The infection may or may not be able to be detected by methods for virus infection detection known in the art. The infected individual may or may not be aware of the infection. Typical, but non-exclusive locations of the human body where SARS-CoV-2 may be located in an infected individual, are the respiratory system including the nasal passages and/or cells thereof, the ocular system and/or cells thereof, and the cardiovascular system and/or cells thereof. The term ‘SARS-CoV-2 virus infection’, as used herein, further includes reference to the entrance and residence of a part of a SARS-CoV-2 virus of any type that is able to cause viral replication in a human host. The term ‘SARS-CoV-2 virus infection’ encompasses SARS-CoV-2 disease (Severe Acute Respiratory Syndrome) and is preferably SARS-CoV-2 disease (Covid-19). The term ‘SARS-CoV-2 virus infection’ can be used interchangeably with ‘SARS-CoV-2 viral infection’. The term ‘individual’, as used herein, includes reference to a mammal or human that is subject to, or a risk of suffering from, SARS-CoV-2 viral infection. Infection may take place in any system, tissue or cell belonging to the host, including the host’s microbiome. SARS-CoV-2 virus infection and the disease Covid-19 may occur in individuals of all age groups and sexes. Nonetheless, preferably, the individual is a human, in particular an elderly human such as a human that is at least 60, 65, 70, 75, 80, or at least 85 years old. Preferably, the individual is at risk of suffering from Severe Acute Respiratory Syndrome once infected. In embodiments, the individual has an underlying disease such as (i) a respiratory disease such as asthma, COPD, chronic bronchitis and lung emphysema, (ii) cardiovascular disease such as cardiac arrhythmia or individuals that have received cardiac surgery, (iii) diabetes, (iv) renal failure and/or (v) a disease affecting the immune system, for instance immunocompromised individuals. The terms ‘administering’ and ‘administration’, as used herein, include reference to the provision of one or more drug and optionally one or more adjuvant with the aim to treat, cure, reduce, or prevent a disease or its symptoms in an individual, or to promote the individual’s well-being. Preferred methods of administration of the antibody as disclosed herein include intranasal administration and oral inhalation. The phrase ‘an individual in need thereof’, as used herein, includes reference to a mammal such as a human that benefits from a specified therapy. As a treatment method of the invention the polypeptides as disclosed herein may be used prophylactically, the exhibition of symptoms or indications for SARS-CoV-2 virus infection are not required. Individuals that are especially in need of the method or antibody for use of the invention, are individuals with an elevated risk of SARS-CoV-2 virus infection, individuals with an elevated risk of Covid-19 , individuals with an elevated risk of developing severe symptoms (illness) of Covid-19, and/or individuals with an elevated risk of dying from Covid-19. The person skilled in the art is aware of the risk factors for an elevated risk of SARS-CoV-2 virus infection, an elevated risk of Covid-19, an elevated risk of developing severe symptoms of Covid-19, and an elevated risk of dying from Covid-19. The term ‘intranasally’, as used herein, may also be referred to as ‘nasal administration’, and includes reference to a route of administration in which a drug is provided into the upper respiratory tract, preferably through the nostrils, as part of a prophylactic and/or therapeutic treatment as disclosed herein. Preferably, the administration provides for drug in the nasal cavity. The back section of the nasal cavity is also referred to as the pharynx. Nasal administration preferably provides for delivery of polypeptides as disclosed herein in the mucous membrane lining the nasal cavity. Intranasal administration can be performed by the use of for instance a nasal spray or nose drops. In some embodiments, the drug is delivered to the nasal cavity via the oral route. For example, RetroNose uses a breath-actuated pressurised metered-dose inhaler (pMDI) to administer drugs through the buccal cavity during the nasal expiratory phase. Such methods allow the drug particles to enter the nasal cavities through the rhinopharynx. Preferably, the polypeptides of the invention are administered intranasally. The term ‘oral inhalation’, as used herein, may also be referred to as ‘mouth inhalation’, and includes reference to a route of administration in which a drug is provided through the mouth to the lower respiratory tract such as the lungs, as part of a prophylactic and/or therapeutic treatment of the invention. Oral inhalation may for example be applied for drugs in their powdered form and drugs in the form of liquid droplets or aerosols. Preferably, the polypeptides of the invention are administered by oral inhalation. The term ‘prior to’, as used herein, includes reference to the administration of a polypeptide before an individual has been exposed to, or is infected with, a SARS-CoV-2 virus. Preferably, the polypeptide as disclosed is administered to an individual up to 24 hours prior to SARS-CoV-2 virus exposure, for example between zero and 24 hours before the individual has been exposed to said SARS-CoV-2 virus. In some embodiments, the polypeptide is administered at least 2 days, 3 days, 4 days or more prior to SARS-CoV-2 virus exposure. The term ‘dosage’ as used herein, refers to the amount of polypeptide to be given at a particular time (e.g., over the course of a 24-hour, 12-hour, 30 minute period, etc.). A dose refers to a single dosing episode, whether the dose is a unit dosage form or multiple unit dosage forms taken together (e.g., ingestion of two or more pills, receiving two or more injections). A dosage includes reference to a pharmaceutical dosage form wherein the medicament is packaged for administration as, e.g., a single-unit dose or multiple-unit dose. A dosage may also be administered as, e.g., one or more drops of a polypeptide-comprising composition (e.g., nasal drops or eye drops) or one or more sprays of a polypeptide-comprising composition (e.g., nasal sprays). Preferably, a suitable dosage of a polypeptide as disclosed herein contains a dose of between 0.01 µg and 20 mg, preferably 0.05 µg to 10 mg, more preferably around 0.10 µg to 5 mg or even around 1 - 2 mg, e.g. when the dosage is for intranasal administration. Such dosages are also referred to as “flat dosages” or “nominal doses” in contrast to dosages based on the weight of the patient. Flat dosages have the advantage that the medicament can be packaged in a single-unit dose, for example. A single dose of the polypeptide can provide protection from SARS-CoV-2 infection for several days and may be provided “on demand” or “as needed”. For example, an individual may administer the polypeptide before leaving the house or before coming into contact with other individuals. In order to provide long-lasting protection, the polypeptide may be administered on a regular basis. For example, the polypeptide is administered once, or at least once per month. In a preferred embodiment, the polypeptide is administered once, or at least once per week, e.g., twice weekly. In a preferred embodiment, the polypeptide is administered once, or at least once per day. As is clear to a skilled person, less polypeptide may be administered when the polypeptide is administered more frequently (e.g., daily). In a preferred embodiment, between 0.1 mg to 20 mg of polypeptide is administered per week (e.g., once or twice weekly or daily). In an exemplary embodiment, 0.1 mg to1 mg is administered daily (i.e, 0.7 mg to 7 mg per week). In an exemplary embodiment, 0.5 mg to 3.5 mg is administered twice weekly (i.e., 1 mg to 7 mg per week). The present invention relates inter alia to a polypeptide for use in a method for treatment of SARS-CoV-2 virus infection in an individual, more specifically the antibody can be used in a method for the prophylactic and/or therapeutic treatment of SARS-CoV-2 virus infection in an individual. Preferably, the individual is a mammal, more preferably a human. The route of administration of the polypeptide as disclosed herein is intranasally or by oral inhalation. Preferably, a polypeptide as disclosed herein is capable of neutralizing at least one or more, preferably two or more, preferably three or more, preferably four or more, even more preferably five or more SARS-CoV-2 variants. The polypeptide as disclosed herein may be capable of specifically binding to the S2 subunit of the spike protein of the SARS-CoV-2 virus. Preferably, the polypeptide as disclosed herein is capable of specifically binding to an epitope in the stem region of the spike protein of the SARS- CoV-2 virus, more preferably, the polypeptide as disclosed herein binds to an epitope that is accessible in the pre-fusion conformation of the spike protein of the SARS-CoV-2 virus. The polypeptide as disclosed herein may be capable of specifically binding to SARS-CoV-2 viruses that are in attenuated or inactivated form or that are viable, living and/or in the infective form. Methods for attenuating or inactivating virus, e.g. SARS-CoV-2 viruses are well known in the art and include, but are not limited to, treatment with formalin, P-propiolactone (BPL), merthiolate, and/or ultraviolet light. The polypeptide as disclosed herein may also be capable of specifically binding to one or more fragments of the SARS-CoV-2 viruse, such as one or more recombinantly produced proteins and/or polypeptides of SARS- CoV-2 or a preparation of one or more proteins and/or (poly)peptides derived from variants of SARS-CoV-2. The amino acid and/or nucleotide sequence of proteins of various SARS- CoV-2 variants can be found in the EMBL-database, GenBank-database, SARS-CoV-2 Sequence Database (ISD), and/or other databases. It is well within the reach of the skilled person to find such sequences in the respective databases. An "epitope", as used herein, includes reference to a moiety that is capable of binding to a polypeptide as disclosed herein with sufficiently high affinity to form a detectable antigen-polypeptide complex. The polypeptide as disclosed herein can be used in isolated or non-isolated form. The polypeptide as disclosed herein can be used alone or in a mixture comprising the polypeptide (or variant or fragment thereof) as disclosed herein. Furthermore, the polypeptides as disclosed herein can be used with other polypeptides that bind to SARS-CoV-2 and have SARS-CoV-2 virus inhibiting effect. In other words, the polypeptide as disclosed herein can be used in combination, e.g., as a pharmaceutical composition comprising two or more polypeptides that specifically bind SARS-CoV-2 virus. For example, polypeptides having different, but complementary activities can be combined in a single therapy to achieve a desired therapeutic or prophylactic effect, but alternatively, polypeptides having identical activities can also be combined in a single therapy to achieve a desired prophylactic or therapeutic effect. Optionally, the mixture further comprises at least one other therapeutic agent. Preferably, the therapeutic agent such as, e.g., neuraminidase inhibitors (e.g., zanamivir, oseltamivir) and/or M2 inhibitors (e.g., amantidine, rimantadine) is useful in the prophylaxis and/or treatment of a SARS-CoV-2 virus infection. Preferably, the composition comprises a single anti-SARS-CoV-2 virus, wherein the antibody is as disclosed herein. The polypeptide as disclosed herein is preferably able to recognize and bind to the HA protein of SARS-CoV-2. Preferably, the polypeptide as disclosed herein is able to cross-neutralize SARS-CoV-2 variants. The skilled person can determine whether a polypeptide indeed cross-reacts with HA proteins from different variants of the SARS-CoV-2 virus. A polypeptide as disclosed herein is administered intranasally or by oral inhalation. With intranasal administration, a polypeptide is provided through the nostrils to the upper respiratory tract as part of a prophylactic and/or therapeutic treatment as disclosed herein. Preferably, the administration provides for polypeptide in the nasal cavity. The back section of the nasal cavity is also referred to as pharynx. Nasal administration can either be a form of topical administration or systemic administration, as the polypeptides thus locally delivered can go on to have either local or systemic effects. In the present case, with polypeptides as disclosed herein, nasal administration is preferably a form of topical administration. Nasal administration preferably provides for delivery of polypeptides as disclosed herein in the mucous membrane lining the nasal cavity. Intranasal administration can be performed by the use of for instance a nasal spray or nose drops. When the composition is a nasal spray, the liquid aerosol will preferably comprise droplets smaller than 500 µm, preferably less than 100 µm in diameter (as measured using laser diffraction). These droplets will deposit the nasal passages and will therefore have a better deposition pattern. Intranasal administration as disclosed herein may be done using a medicament in liquid form, preferably in the form of drops or nasal spray. The aqueous liquid may comprise adjuvants. These adjuvants may for example be salts, oils, cytokines, emulsifiers, buffering agents, carbohydrates and combinations thereof. Intranasal administration may also be done using a medicament in solid form, such as powders. With oral inhalation, the polypeptide is provided through the mouth to the respiratory tract, preferably lower respiratory tract such as lungs, as part of a prophylactic and/or therapeutic treatment of the invention. As described further herein, oral inhalation also includes nasal drug delivery (also referred to as nasal drug delivery via the oral route). Oral inhalation may for example be applied for polypeptides in their powdered form and polypeptides in the form of liquid droplets or aerosols. Oral inhalation may include the use of an inhaler. The inhaler may be involved in the achievement of the dose that was determined. The polypeptide that is administered by oral inhalation may reach the lung, but may also partially be cleared out by exhalation. Administration by oral inhalation as disclosed herein may be done using a medicament comprising aerosols in powdered (solid) or liquid form. Powdered aerosols comprising particles smaller than 5 µm in diameter will primarily reach the respiratory region of the lung, and will therefore be absorbed better than larger particles. The medicament may comprise adjuvants. These adjuvants may for example be salts, oils, cytokines, emulsifiers, buffering agents, carbohydrates and combinations thereof. The invention also provides a composition formulated for intranasal administration and/or oral inhalation comprising a polypeptide as disclosed herein, preferably in a single dose unit between 0.01 µg to 20 mg or preferably 0.10 µg to 10mg, wherein the antibody is as defined herein above in relation to the treatment methods. In some embodiments, the polypeptides as disclosed herein are the sole active ingredient in the treatment, e.g., the polypeptide is provided in a composition as the sole active ingredient. In some embodiments, the polypeptide disclosed herein is the sole polypeptide, in particular the sole anti-SARS-CoV-2 polypeptide, in the treatment, e.g., the polypeptide is provided in a composition as the sole polypeptide, in particular the sole anti-SARS-CoV-2 polypeptide. Preferably, compositions are providing comprising an anti-SARS-CoV-2 polypeptide consisting of the polypeptide disclosed herein. In such compositions, no other anti-SARS-CoV-2 polypeptides are present. Preferably, in a composition of the invention, the polypeptide is a polypeptide as disclosed in relation to a treatment method of the invention. Preferably, the composition of the invention is a water-based composition such as an aqueous liquid. Preferably, the composition of the invention further comprises one or more salts, for example sodium chloride. The composition of the invention may further comprise one or more buffering agents, for example sodium acetate. The composition of the invention may further comprise one or more carbohydrates, such as sucrose, or other active ingredients, such as other polypeptides, neuraminidase inhibitors, endonuclease inhibitors, and adjuvants such as oils, cytokines, emulsifiers, or combinations thereof. The pH of the composition of the invention can have a pH of between 4 and 7, more preferably around 5.5. For the purpose of clarity and a concise description, features may be described herein as part of the same or separate embodiments, however, it will be appreciated that the disclosure includes embodiments having combinations of all or some of the features described. References to “method for treatment”, “treatment method”, “polypeptide for use” and “use of a polypeptide in the manufacture of a medicament” can be used interchangeably and embodiments disclosed in relation to any one of those aspects also applies in relation to said other aspects. In other words, they all refer to medical treatments involving a polypeptide as disclosed herein. Peptibody Preferably the polypeptides disclosed herein are incorporated into a peptibody. A peptibody is composed of two moieties, a biologically active polypeptide as disclosed herein and an Fc region. By fusing a polypeptide to part or all of an antibody, a peptibody combines the activity of a peptide with the longer duration of activity of an antibody. Lipid Nano-Particle (LNP) Preferably the polypeptides disclosed herein are incorporated into a LNP. A LNP usually only have a single phospholipid outer layer that encapsulates the interior comprising the polypeptides disclosed herein, the interior may be non-aqueous. By encapsulating the polypeptides disclosed herein polypeptides, a LNP protects the polypeptides from proteases and thus ensures longer duration of activity of the polypeptides. SEQUENCES (SEQ ID NO: 001) EWMGIINPRGDGT (SEQ ID NO: 002) EWMGIINPRGDGTR (SEQ ID NO: 003) EWMGIINPRGDGTRY (SEQ ID NO: 004) EWMGIINPRGDGTRYA (SEQ ID NO: 005) EWMGIINPRGDGTRYAQ (SEQ ID NO: 006) EWMGIINPRGDGTRYAQK (SEQ ID NO: 007) EWMGIINPRGDGTRYAQKF (SEQ ID NO: 008) EWMGIINPRGDGTRYAQKFQ (SEQ ID NO: 009) EWMGIINPRGDGTRYAQKFQG (SEQ ID NO: 010) EWMGIINPRGDGTRYAQKFQGR (SEQ ID NO: 011) EWMGIINPRGDGTRYAQKFQGRV (SEQ ID NO: 012) EWMGIINPRGDGTRYAQKFQGRVT (SEQ ID NO: 013) EWMGIINPRGDGTRYAQKFQGRVTM (SEQ ID NO: 014) EWMGIINPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 015) GDGTRYA (SEQ ID NO: 016) GDGTRYAQ (SEQ ID NO: 017) GDGTRYAQK (SEQ ID NO: 018) GDGTRYAQKF (SEQ ID NO: 019) GDGTRYAQKFQ (SEQ ID NO: 020) GDGTRYAQKFQG (SEQ ID NO: 021) GDGTRYAQKFQGR (SEQ ID NO: 022) GDGTRYAQKFQGRV (SEQ ID NO: 023) GDGTRYAQKFQGRVT (SEQ ID NO: 024) GDGTRYAQKFQGRVTM (SEQ ID NO: 025) GDGTRYAQKFQGRVTMT (SEQ ID NO: 026) GIINPRGDG (SEQ ID NO: 027) GIINPRGDGT (SEQ ID NO: 028) GIINPRGDGTR (SEQ ID NO: 029) GIINPRGDGTRY (SEQ ID NO: 030) GIINPRGDGTRYA (SEQ ID NO: 031) GIINPRGDGTRYAQ (SEQ ID NO: 032) GIINPRGDGTRYAQK (SEQ ID NO: 033) GIINPRGDGTRYAQKF (SEQ ID NO: 034) GIINPRGDGTRYAQKFQ (SEQ ID NO: 035) GIINPRGDGTRYAQKFQG (SEQ ID NO: 036) GIINPRGDGTRYAQKFQGR (SEQ ID NO: 037) GIINPRGDGTRYAQKFQGRV (SEQ ID NO: 038) GIINPRGDGTRYAQKFQGRVT (SEQ ID NO: 039) GIINPRGDGTRYAQKFQGRVTM (SEQ ID NO: 040) GIINPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 041) GLEWMGIINPRGDGTR (SEQ ID NO: 042) GLEWMGIINPRGDGTRY (SEQ ID NO: 043) GLEWMGIINPRGDGTRYA (SEQ ID NO: 044) GLEWMGIINPRGDGTRYAQ (SEQ ID NO: 045) GLEWMGIINPRGDGTRYAQK (SEQ ID NO: 046) GLEWMGIINPRGDGTRYAQKF (SEQ ID NO: 047) GLEWMGIINPRGDGTRYAQKFQ (SEQ ID NO: 048) GLEWMGIINPRGDGTRYAQKFQG (SEQ ID NO: 049) GLEWMGIINPRGDGTRYAQKFQGR (SEQ ID NO: 050) GLEWMGIINPRGDGTRYAQKFQGRV (SEQ ID NO: 051) GLEWMGIINPRGDGTRYAQKFQGRVT (SEQ ID NO: 052) GQGLEWMGIINPRGDGTR (SEQ ID NO: 053) GQGLEWMGIINPRGDGTRY (SEQ ID NO: 054) GQGLEWMGIINPRGDGTRYA (SEQ ID NO: 055) GQGLEWMGIINPRGDGTRYAQ (SEQ ID NO: 056) GQGLEWMGIINPRGDGTRYAQK (SEQ ID NO: 057) GQGLEWMGIINPRGDGTRYAQKF (SEQ ID NO: 058) INPRGDG (SEQ ID NO: 059) INPRGDGT (SEQ ID NO: 060) INPRGDGTR (SEQ ID NO: 061) INPRGDGTRY (SEQ ID NO: 062) INPRGDGTRYA (SEQ ID NO: 063) INPRGDGTRYAQ (SEQ ID NO: 064) INPRGDGTRYAQK (SEQ ID NO: 065) INPRGDGTRYAQKF (SEQ ID NO: 066) INPRGDGTRYAQKFQ (SEQ ID NO: 067) INPRGDGTRYAQKFQG (SEQ ID NO: 068) INPRGDGTRYAQKFQGR (SEQ ID NO: 069) INPRGDGTRYAQKFQGRV (SEQ ID NO: 070) INPRGDGTRYAQKFQGRVT (SEQ ID NO: 071) INPRGDGTRYAQKFQGRVTM (SEQ ID NO: 072) INPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 073) IINPRGDG (SEQ ID NO: 074) IINPRGDGT (SEQ ID NO: 075) IINPRGDGTR (SEQ ID NO: 076) IINPRGDGTRY (SEQ ID NO: 077) IINPRGDGTRYA (SEQ ID NO: 078) IINPRGDGTRYAQ (SEQ ID NO: 079) IINPRGDGTRYAQK (SEQ ID NO: 080) IINPRGDGTRYAQKF (SEQ ID NO: 081) IINPRGDGTRYAQKFQ (SEQ ID NO: 082) IINPRGDGTRYAQKFQG (SEQ ID NO: 083) IINPRGDGTRYAQKFQGR (SEQ ID NO: 084) IINPRGDGTRYAQKFQGRV (SEQ ID NO: 085) IINPRGDGTRYAQKFQGRVT (SEQ ID NO: 086) IINPRGDGTRYAQKFQGRVTM (SEQ ID NO: 087) IINPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 088) INPRGDG (SEQ ID NO: 089) INPRGDGT (SEQ ID NO: 090) INPRGDGTR (SEQ ID NO: 091) INPRGDGTRY (SEQ ID NO: 092) INPRGDGTRYA (SEQ ID NO: 093) INPRGDGTRYAQ (SEQ ID NO: 094) INPRGDGTRYAQK (SEQ ID NO: 095) INPRGDGTRYAQKF (SEQ ID NO: 096) INPRGDGTRYAQKFQ (SEQ ID NO: 097) INPRGDGTRYAQKFQG (SEQ ID NO: 098) INPRGDGTRYAQKFQGR (SEQ ID NO: 099) INPRGDGTRYAQKFQGRV (SEQ ID NO: 100) INPRGDGTRYAQKFQGRVT (SEQ ID NO: 101) INPRGDGTRYAQKFQGRVTM (SEQ ID NO: 102) INPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 103) LEWMGIINPRGDGTR (SEQ ID NO: 104) LEWMGIINPRGDGTRY (SEQ ID NO: 105) LEWMGIINPRGDGTRYA (SEQ ID NO: 106) LEWMGIINPRGDGTRYAQ (SEQ ID NO: 107) LEWMGIINPRGDGTRYAQK (SEQ ID NO: 108) LEWMGIINPRGDGTRYAQKF (SEQ ID NO: 109) LEWMGIINPRGDGTRYAQKFQ (SEQ ID NO: 110) LEWMGIINPRGDGTRYAQKFQG (SEQ ID NO: 111) LEWMGIINPRGDGTRYAQKFQGR (SEQ ID NO: 112) LEWMGIINPRGDGTRYAQKFQGRV (SEQ ID NO: 113) LEWMGIINPRGDGTRYAQKFQGRVT (SEQ ID NO: 114) LEWMGIINPRGDGTRYAQKFQGRVTM (SEQ ID NO: 115) LEWMGIINPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 116) MGIINPRGDG (SEQ ID NO: 117) MGIINPRGDGT (SEQ ID NO: 118) MGIINPRGDGTR (SEQ ID NO: 119) MGIINPRGDGTRY (SEQ ID NO: 120) MGIINPRGDGTRYA (SEQ ID NO: 121) MGIINPRGDGTRYAQ (SEQ ID NO: 122) MGIINPRGDGTRYAQK (SEQ ID NO: 123) MGIINPRGDGTRYAQKF (SEQ ID NO: 124) MGIINPRGDGTRYAQKFQ (SEQ ID NO: 125) MGIINPRGDGTRYAQKFQG (SEQ ID NO: 126) MGIINPRGDGTRYAQKFQGR (SEQ ID NO: 127) MGIINPRGDGTRYAQKFQGRV (SEQ ID NO: 128) MGIINPRGDGTRYAQKFQGRVT (SEQ ID NO: 129) MGIINPRGDGTRYAQKFQGRVTM (SEQ ID NO: 130) MGIINPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 131) NPRGDG (SEQ ID NO: 132) NPRGDGT (SEQ ID NO: 133) NPRGDGTR (SEQ ID NO: 134) NPRGDGTRY (SEQ ID NO: 135) NPRGDGTRYA (SEQ ID NO: 136) NPRGDGTRYAQ (SEQ ID NO: 137) NPRGDGTRYAQK (SEQ ID NO: 138) NPRGDGTRYAQKF (SEQ ID NO: 139) NPRGDGTRYAQKFQ (SEQ ID NO: 140) NPRGDGTRYAQKFQG (SEQ ID NO: 141) NPRGDGTRYAQKFQGR (SEQ ID NO: 142) NPRGDGTRYAQKFQGRV (SEQ ID NO: 143) NPRGDGTRYAQKFQGRVT (SEQ ID NO: 144) NPRGDGTRYAQKFQGRVTM (SEQ ID NO: 145) NPRGDGTRYAQKFQGRVTMT (SEQ ID NO: 146) PRGDGTRYAQ (SEQ ID NO: 147) PRGDGTRYAQK (SEQ ID NO: 148) PRGDGTRYAQKF (SEQ ID NO: 149) PRGDGTRYAQKFQ (SEQ ID NO: 150) PRGDGTRYAQKFQG (SEQ ID NO: 151) PRGDGTRYAQKFQGR (SEQ ID NO: 152) PRGDGTRYAQKFQGRV (SEQ ID NO: 153) PRGDGTRYAQKFQGRVT (SEQ ID NO: 154) PRGDGTRYAQKFQGRVTM (SEQ ID NO: 155) PRGDGTRYAQKFQGRVTMT (SEQ ID NO: 156) QGLEWMGIINP (SEQ ID NO: 157) QGLEWMGIINPR (SEQ ID NO: 158) QGLEWMGIINPRG (SEQ ID NO: 159) QGLEWMGIINPRGD (SEQ ID NO: 160) QGLEWMGIINPRGDG (SEQ ID NO: 161) QGLEWMGIINPRGDGT (SEQ ID NO: 162) QGLEWMGIINPRGDGTR (SEQ ID NO: 163) QGLEWMGIINPRGDGTRY (SEQ ID NO: 164) QGLEWMGIINPRGDGTRYA (SEQ ID NO: 165) QGLEWMGIINPRGDGTRYAQ (SEQ ID NO: 166) QGLEWMGIINPRGDGTRYAQK (SEQ ID NO: 167) QGLEWMGIINPRGDGTRYAQKF (SEQ ID NO: 168) RGDGTRYA (SEQ ID NO: 169) RGDGTRYAQ (SEQ ID NO: 170) RGDGTRYAQK (SEQ ID NO: 171) RGDGTRYAQKF (SEQ ID NO: 172) RGDGTRYAQKFQ (SEQ ID NO: 173) RGDGTRYAQKFQG (SEQ ID NO: 174) RGDGTRYAQKFQGR (SEQ ID NO: 175) RGDGTRYAQKFQGRV (SEQ ID NO: 176) RGDGTRYAQKFQGRVT (SEQ ID NO: 177) RGDGTRYAQKFQGRVTM (SEQ ID NO: 178) RGDGTRYAQKFQGRVTMT (SEQ ID NO: 179) WMGIINPRGDG (SEQ ID NO: 180) WMGIINPRGDGT (SEQ ID NO: 181) WMGIINPRGDGTR (SEQ ID NO: 182) WMGIINPRGDGTRY (SEQ ID NO: 183) WMGIINPRGDGTRYA (SEQ ID NO: 184) WMGIINPRGDGTRYAQ (SEQ ID NO: 185) WMGIINPRGDGTRYAQK SEQ ID NO: 186) WMGIINPRGDGTRYAQKF (SEQ ID NO: 187) WMGIINPRGDGTRYAQKFQ (SEQ ID NO: 188) WMGIINPRGDGTRYAQKFQG (SEQ ID NO: 189) WMGIINPRGDGTRYAQKFQGR (SEQ ID NO: 190) WMGIINPRGDGTRYAQKFQGRV (SEQ ID NO: 191) WMGIINPRGDGTRYAQKFQGRVT (SEQ ID NO: 192) WMGIINPRGDGTRYAQKFQGRVTM (SEQ ID NO: 193) WMGIINPRGDGTRYAQKFQGRVTMT EXAMPLES Example 1: Intranasal administration of polypeptides for the treatment of SARS-CoV-2 The objective of this study is to compare the prophylactic efficacy of a single dose of a representative polypeptide, having SEQ ID NO: 082. Animals (n=10 per group) are treated with an intranasal dose range of the test polypeptide (10 to 0.2 mg/kg) or PBS control at study day -1. At study day 0 animals are challenged with 25 LD50 of SARS-CoV-2 B.1.351 variant. Materials & methods The test item is a synthesized polypeptide having SEQ ID NO: 082. The polypeptide is dissolved in DMSO and diluted with phosphate-buffered saline (PBS) to adjust the final concentration of DMSO to 10%, thereby preparing a polypeptide-DMSO-PBS solution. The polypeptide having SEQ ID NO: 082 is made up at various concentrations so that 100 uL administrations to a 20 g mouse will result in polypeptide doses ranging from 10 mg/kg, 5 mg/kg, 2.5 mg/kg, 0.5 mg/kg to 0.2 mg/kg. The formulations are stored at -75°C ± 10°C. The temperature is monitored. The virus strain tested is SARS-CoV-2 B.1.351 variant, obtainable from ATCC. Animals The animal species and breed is Mouse (Mus musculus), SARS-CoV-2 Delta K18 hACE2 Tg mouse model or BALB/c AnNCrl, SPF at a weight of c. 16-18 g on the day of arrival at the facility. 60 mice are used at the age of 6-8 weeks on the day of arrival at the facility and are exclusively female. Ten animals are randomly allocated to 6 treatment groups. Potable water from the public supply is available ad libitum from water bottles. The animals have free access to feed (RMH-B from Altromin, Germany). Mice are maintained between a minimum and maximum temperature of 20.9°C and 21.4°C and at relative humidity percentage between 35 and 42%, under artificial lighting with 12 hours light and 12 hours dark. Study design The dose level of test polypeptide applied in the current example is based on a dose range proven to have prophylactic activity. A total number of 60 mice, 6 weeks of age at the time of arrival, are transported to the animal Facility and allocated to 6 experimental groups according to Table 1. Mice are given a period of 6 days for acclimatization. For studies with BALB/c AnNCrl mice, mice of 12 months of age are allocated to 6 experimental groups according to Table 1 (Zhang et al. Journal of Virology 95:e02477-202021). Table 1. Treatment schedule Female SARS-CoV-2 Delta K18 hACE2 Tg mouse model or BALB/c mice are treated via the intranasal route of administration with the polypeptide at a dose between 10 and 0.2 mg/kg based upon average mouse mass of 20 g. On Day 0, all mice are challenged with a lethal dose of SARS-CoV-2 B.1.351 variant and observed for clinical signs and weight loss until the end of the study at day 21. Polypeptide administration The test polypeptide is stored at -75°C ± 10°C upon arrival. The appropriate dose, according to the treatment schedule (Table1), is formulated assuming the average mass of each mouse to be 20 g. On the day of administration, the test polypeptide solutions are kept on ice during transfer to the animal facility. Just prior to dosing, the material is drawn into a syringe, allowed briefly to warm to room temperature and then administered to each mouse. Mice receive the indicated dose by intranasally administering 50 μL of polypeptide solution into the left and right nare (100 μL per mouse) using a pipette tip. Virus administration The virus material is stored at -75°C ± 10°C and is defrosted prior to administration. Once defrosted, the material is diluted in cold PBS corresponding to approximately 25 LD50 and kept on ice until administration to the mice. As required, the animals are anesthetized by intraperitoneal injection of a mixture of ketamine/ xylazine and each animal receives approximately 50 µL of virus corresponding with approximately 3.1 log10 TCID50 by intranasal inoculation using a pipette tip. Unused material is returned on ice to the lab for back titration along with the material that is kept on ice in the lab during inoculation of the animals. Laboratory analysis Laboratory analyses are performed in class II biological safety cabinets. Inoculum is returned to the lab and the actual dose of the virus administered is verified by titrating eight replicate samples on MDCK cells. Virus titres (TCID ₅₀ /mL) are determined by the method of Reed and Münch. Clinical monitoring General health observations are performed on each animal from the day of arrival until the end of the study at least once daily (during normal servicing procedures). Clinical signs are scored from day -1 until the end of the study on day 21 using a scoring system (0 = no clinical signs; 1 = rough coat; 2 = rough coat, less reactive during handling; 3 = rough coat, rolled up, labored breathing, less reactive during handling; 4 = rough coat, rolled up, labored breathing, inactive in response to manipulation/handlings). Animals are inspected twice a day as long as they received a score of 3 and are euthanized when they received a score of 4 (humane end point). Each animal is weighed daily beginning one day prior to infection (day -1). Calibrated weighing scales are used. Terminal investigations At the end of the study, on day 21, mice are euthanized by i.v. injection of Euthasol® (sodium pentobarbital) followed by cervical dislocation. Gross necropsy is not performed. Data analysis and statistical methods Survival proportions at day 21, survival times and change in bodyweight (Area Under the Curve) are compared to the corresponding control group using Fisher’s exact test, log-rank and Welch's t-test, respectively. All groups are compared to the corresponding vehicle (DMSO-PBS solution) control group. Comparisons are performed using a stepwise approach within each treatment route (starting with the highest antibody dose conditionally testing a lower dose if the previous step is statistically significant). Statistical analysis is performed using R and statistical significance is set at α = 0.05. Survival - Intranasal Prophylactic treatment with ≥ 0.2 mg/kg test polypeptide is completely protective: 100% of the animals survived the viral challenge whereas the survival proportion at day 21 in the control group is 0%. The median survival time of the control group is 7 days. Survival times of the test polypeptide treated groups are compared to the control group using a log-rank test. Prophylactic treatment with ≥ 0.2 mg/kg test polypeptide results in a significant improvement in survival time. Body weight Change in bodyweight is analysed using an Area Under the Curve (AUC) analysis in which the last observed body weight is carried forward if a mouse died / is euthanized during the study. The weight per mouse at day 0 is used as baseline and weight change is determined relative to baseline. The net AUC’s is compared using a Welch’s t-test due to unequal variances. Area under the curve results, for the intranasal prophylactic treatment group are determined. Intranasal Prophylactic treatment with ≥ 0.2 mg/kg test polypeptide results in a significant reduction in weight loss compared to the control group. No clinical signs are recorded in the groups treated with ≥ 0.2 mg/kg test polypeptide. All animals survived the challenge with SARS-CoV-2 B.1.351 variant Clinical score Median Clinical Scores, for the intranasal group is determined. Conclusion In this lethal SARS-CoV-2 B.1.351 variant mouse model, the prophylactic intranasal administration of ≥ 0.2 mg/kg test polypeptide provides 100% survival and a reduction in weight loss, whereas all the animals in the control group die.