Due to the lack of proofreading in RNA-dependent RNA polymerases, RNA viruses have extraordinarily high rates of mutation. The average RNA virus genome experiences one mutation per ten thousand nucleotides per replication, a rate of mutation almost a million times faster than the average bacterial genome.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2937809/

Can herd immunity faggots fuck off the board now?