IL4 and COVID-19: Removing ICAM-1 in the Common Cold cocktail and adding sACE2 resulted in COVID-19 Cocktail A. Removing sIL-4Rα from Cocktail A and adding IL-4 and IL-13 made Cocktail B, whereas adding IL-4 to Cocktail A gave Cocktail C. Adding IL-13 to Cocktail C gave Cocktail D.