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The spread of highly contagious coronavirus variants is threatening to fuel a "potential fourth surge of cases" in the US, a top health official has warned. The head of the US Centers for Disease Control and Prevention (CDC) said she was concerned by recent Covid-19 data. Dr Rochelle Walensky said about 70,000 new cases a day had been recorded last week - "a very high number". There were nearly 2,000 swaths a day in the same period, she added.Given this, Dr Walensky said she was "really worried" about reports of US states "rolling back the exact public health measures we have recommended to protect people from Covid-19". "We have the ability to stop a potential fourth surge of cases in this country. Please stay strong in your conviction," she said. Please hear me clearly: at this level of cases, with variants spreading, we stand to completely lose the hard-earned ground we have gained," Dr Walensky said. "These vari