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Britain's Secretary of State for Health and Social Care Matt Hancock (L) and Chief Medical Officer for England Chris Whitty arrive at 10 Downing Street to attend an emergency meeting in London, Britain, on March 2, 2020. British Prime Minister Boris Johnson on Monday chaired a meeting of the government's COBRA emergency committee amid rising threat of the novel coronavirus as Britain confirmed four new COVID-19 cases on the same day, bringing its total number of infections to 40. (Photo by Ray Tang/Xinhua)