RT @DrEricDing
NEW KID ON THE BLOCK—#BA2’s new spin off #BA2121 sub-subvariant is now surging exponentially—so infectious that it is outpacing even #Ba2 and completely displacing #Omicron, which is now near extinct. Together #BA2 and #BA2121 are now 94% of all strains in US.

HT @DrWilliamKu