The director of the federal Centers for Disease Control and Prevention (CDC), Rochelle Walensky, warned that a recent increase in coronavirus cases indicated a fourth surge could occur before a majority of the US had been vaccinated.

According to Johns Hopkins University, the US has recorded more than 28.5m Covid-19 cases and nearly 513,000 deaths. Daily case numbers fell steeply after a peak in January but have started to increase again, boosted by the spread of new variants 

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Source: The Guardian