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In this handout photo provided by Number 10 Downing Street, Britain's Prime Minister Boris Johnson chairs the morning Covid-19 Meeting remotely after self isolating after testing positive for the coronavirus, at 10 Downing Street, London, Saturday, March 28, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (Andrew Parsons/10 Downing Street via AP)