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As some of China’s most populous and economically significant cities battle outbreaks, Chengdu, one of the country’s largest cities, announced a lockdown of its 21.2 million residents as it launched four days of citywide testing for COVID-19. Residents of Chengdu,

A major step towards launching a booster campaign to combat the newest members of the omicron family was taken by Pfizer on Monday when they asked US regulators to approve their combination COVID-19 vaccine. The Food and Drug Administration has