New Covid Variant Most Worrying Yet, Top U.K. Adviser Warns
- Hopkins says B.1.1.529 mutations double the number for delta
- Health secretary Javid says U.K. has no plan to tighten rules
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A new coronavirus variant identified in South Africa is the “most worrying” yet, a senior U.K. health official said, after the government temporarily banned flights from the region to try to limit its spread.