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 

CDC chief warns of 'potential fourth surge' and urges US to keep Covid rules ► https://www.theguardian.com/world/2021/mar/01/cdc-chief-covid-us-coronavirus-cases-potential-fourth-surge

Interview: engineer who created viral vaccine site for $50 ► https://www.theguardian.com/us-news/2021/mar/01/turbovax-vaccine-website-huge-ma

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