The development comes as the United States recently began averaging more than 100,000 new confirmed cases per day again, according to a New York Times database, for the first time since February.

CHICAGO, Jan 30 (Reuters) - The highly transmissible Omicron , opens new tabvariant of the SARS-CoV-2 virus - the most common form of which is known as BA.1 - now accounts for nearly all of the ...