I’d wondered what had happened to epsilon. How many variants does that make now?
“I’d wondered what had happened to epsilon.”
The California variant (Epsilon, B.1.429) had a small run early in the year, but was never a big proportion of US cases.
The UK variant (Alpha B.1.17) was big until recently, when the Indian (Delta, B.1.617.2) and Brazilian (Gamma, P.1) have started spreading more widely. Delta will likely be the dominant strain in the USA this month, and already is in a few States and Los Angeles County.