Omicron XBB.1.5 Rapidly Becomes New Dominant Covid-19 Subvariant, Here Are The Concerns

Now the U.S. is dealing with a new X-factor. Actually, it’s an XBB-factor: the XBB.1.5 Omicron subvariant. The XBB.1.5 comprised an estimated 40.5% of all Covid-19 cases over this past week, based on data from the Centers for Disease Control and Prevention (CDC). That’s up from 21.7% the week prior. That one week jump has vaulted the XBB.1.5 ahead of the BQ.1 and the BQ.1.1 subvariant as the new dominant subvariant in the U.S.