Newest Omicron Covid-19 lineages gaining ground in United States
We’re still in the Age of Omicron, but the face of it keeps changing.
The United States appears to be in the midst of another biological baton pass between Covid-19 variants. The Omicron lineage BA.2 and its spinoff, BA.2.12.1, drove cases this spring, building into waves of infections in places like the Northeast and parts of California. Now, two other forms of Omicron, BA.4 and BA.5, are eating into the BA.2 group’s dominance.
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