NIH director Francis Collins says Omicron Covid may not be the 'last emerging variant' as he warns US to brace for more virus offshoots that could cause 'a lot of concern' | WHAT REALLY HAPPENED X-Frame-Options: SAMEORIGIN

NIH director Francis Collins says Omicron Covid may not be the 'last emerging variant' as he warns US to brace for more virus offshoots that could cause 'a lot of concern'

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