Hydrogel comprising glycerol and a carbomer for treating the respiratory symptoms of covid-19 disease via the nasal route

A method for blocking binding of a coronavirus to nasal epithelial cells of a subject in need thereof, the coronavirus being severe acute respiratory syndrome coronavirus 2 (SARS-COV-2) or one of its variants, the method comprising administering to the subject, via nasal route, a hydrogel comprising more than 99% by mass of water, glycerin, at least one homopolymer of acrylic acid cross-linked with an allyl ether of pentaerythritol, at least one polyol different from the glycerin, and at least one pH adjusting agent, wherein the glycerin is present in an amount of from 30% to 80% by mass of the hydrogel and the mass ratio between the at least one homopolymer of acrylic acid cross-linked with an allyl ether of pentaerythritol and the glycerin is between 1/100 and 5/100.