
Carol @carolprgal
Spread of omicron & subvariants has been ferocious. BA.4 & BA.5 likely be dominant end of summer. Rapid viral evolution of omicron is due to trying to find way around "wall of immunity.” Since many have some immunity only way virus can survive is to mutate https://t.co/Pzuhtv75NY — PolitiTweet.org