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Dr Anthony Fauci, the top US infectious diseases expert, says the country needs to “double down” on public health measures such as mask-wearing and social distancing.
Speaking to Chatham House on Thursday, he warned that the cold weather makes for a “challenging and ominous situation”.
His comments come as the US is seeing a surge in coronavirus cases, with more than 100,000 new cases per day for the past week.
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