Tracking Variants and Viruses Through March 25, XBB.1.5 remained the dominant variant in New England. Meanwhile, the XBB.1.9.1 variant has emerged as a notable variant in New England. The dominant variant: XBB.1.5 (94.5% of cases in New England) Other variants: XBB.1.5.1 (3%), XBB.1.9.1 (1.5%) *Region 1 reflects data from New England. Source: Centers for Disease Control and Prevention