The Omicron subvariants BA.4 and BA.5 have together become dominant in the U.S., the C.D.C. estimates.

The Omicron subvariants BA.4 and BA.5 have together become dominant in the U.S., the C.D.C. estimates.

BEIJING — June, for Shanghai, was supposed to be a time of triumph. After two months of strict lockdown, the authorities had declared the city’s recent coronavirus outbreak under control. Businesses and restaurants were finally reopening. State media trumpeted a return to normalcy, and on the first night of release, people milled in the streets, …

The Omicron subvariants BA.4 and BA.5 have together become dominant in the U.S., the C.D.C. estimates. Read More »