What doctors wish patients knew about the BA.2 Omicron subvariant

With the rolling back of mask requirements and physical distancing, many people have been on a search for a new normal. But there is still reason to be cautious. The highly transmissible and contagious BA.2 Omicron subvariant—dubbed “stealth” Omicron—is now the dominant strain in the United States, causing more than 85% of all COVID-19 cases, according to the Centers for Disease Control and Prevention (CDC). This has led to more questions.

Based on the CDC’s genomic surveillance, the BA.2 or stealth Omicron subvariant is responsible for most new SARS-CoV-2 infections in the U.S. BA.2 is a subvariant of the original SARS-CoV-2 Omicron variant (B.1.1.529), along with BA.1.1 and BA.3.