The animals trials for coronavirus vaccines have always failed because the animals got sick and/or died : Studies in Ferrets : https://t.co/XPyZ2PQHor Cats: https://t.co/bs3kiDskfN Mice : https://t.co/OSQvnb3MAm Mice: https://t.co/2k2ad6WNOD Mice: https://t.co/tmOKfi8cxj