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Another omicron subvariant could be new dominant COVID strain in U.S.
The new subvariant of omicron is now the dominant COVID strain in the US
Omicron subvariant BA.2 becomes dominant COVID-19 strain in US
Highly contagious new Omicron subvariant BA.2.75 latest global Covid challenge
New omicron subvariant could fuel new surge in COVID cases
New COVID-19 variant XBB.1.5 becomes dominant strain in the U.S.
New omicron subvariant accounts for nearly two-thirds of new US COVID-19 cases
New Covid-19 subvariants can reinfect Omicron-recovered patients, early studies find
Omicron subvariant BA.5 becomes dominant in U.S.
New omicron subvariant BA.5 now a majority of U.S. COVID-19 cases
Will vaccines work against BA.2, the new sub-variant of Omicron? Covid-19
'Quite possible' new COVID-19 strain will dominate new Mass. cases