Interesting, brief article.
Yeah I’ve seen that L and S strain mentioned. One article suggested that the tamer S is what’s in Seattle, China obviously having the more virulent L.
With any luck maybe the S will provide some immunity to the L strain.
It’s interesting that this New Scientist piece says that the two strains were present from the start. Some sites assumed it was mutating, apparently RNA viruses like Covid-19 are unstable and mutate very easily.