The XBB.1.5 variant is on a growth spurt in USA
As everyone who has been following the Omicron family of SARS-CoV-2 descendants in recent months, there’s a swarm of new subvariants. One of these is XBB, which is a recombinant (fusion) of 2 different BA.2 variants, BJ.1 (BA.2.10.1.1) and BA.2.75 (BA.2.75.3.1.1.1), depicted below by both the tree and mutation map. Phylogenetic tree with scale bar indicating genetic distance, from Wang et al , Cell Mutation map by Tom Peacock Dr. Emma Hodcroft also has a terrific diagram to show the recombination between 2 variants that resulted in XBB Now it appears that in New York State, XBB evolved further to XBB.1.5, with new mutations, which was aptly first noted by JP Weiland a couple of weeks ago, coincident with the beginning of a steep rise of hospitalizations there. The key mutation of XBB.1.5 is clearly F486P, which had been identified many months ago by the Bloom lab as o...