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Antigone Davis, global head of safety at Facebook, said in a post on the company's official website that Facebook is introducing new features that can detect and prevent unwanted contact like friend requests and messages from blocked users who may make a second attempt by setting up a new account.

Another positive factor was pharma giant Eli Lilly's announcement that it applied for an emergency use authorization for a lab-produced antibody treatment against Covid-19, after early trial results showed it reduced viral load, symptoms and hospitalization rates.

Another 400,520 doses of substandard vaccine were produced by the Wuhan institute. Of those, 210,000 were sold to Hebei province and 190,520 went to Chongqing.

Anne Schuchat, second in command at the CDC, said that limited testing and delayed travel alerts contributed to the rapid spread of the novel coronavirus across the United States.

Another factor contributing to SGCC's profitability and increasing presence in overseas projects is that Chinese companies have low construction costs, he said.