WASHINGTON, Dec. 30 (Xinhua) -- Anti-pandemic measures strengthen as U.S. daily COVID-19 cases hit record high of over 510,000.
On Wednesday, the total number of U.S. coronavirus cases had exceeded 53.6 million, with more than 822,000 deaths.
San Francisco on Tuesday announced the cancellation of the city's annual New Year's Eve fireworks show, as the city reported 805 cases, the highest single-day infections.
