How many Covid variants are there; Virus types or strains occur when there is a change/mutation in the genes of the virus. It is normal

Covid variant XBB.1.5; The highly contagious new variant of COVID-19 XBB.1.5 is already dominant in the United States, with numbers doubling

Another new COVID variant; A COVID-19 variant found for the first time in South Africa may be more contagious than other mutations - and may