LOS ANGELES — The highly infectious BA.2 omicron subvariant is now the dominant version of the coronavirus circulating in the United States, according to federal estimates, a development that is triggering fresh concerns of a potential springtime wave.
How big that potential upswing might prove to be remains the subject of much debate. Some officials and experts believe California is well-armored against another significant surge — largely because the vast majority of residents have either been vaccinated or likely have some natural immunity left over from a recent infection.
But BA.2 has fueled substantial increases in other countries, demonstrating how readily the super-contagious subvariant can still spread.
