A more transmissible subvariant, BA.2, has become the dominant strain in the United States as the omicron surge has waned. Those most at risk are the unvaccinated and older than 75
What to know about the omicron variant and subvariant BA.2
A more transmissible subvariant, BA.2, has become the dominant strain in the United States as the omicron surge has waned. Those most at risk are the unvaccinated and older than 75