A top health expert says highly contagious variants of the virus pose a "real threat" to the US.
from BBC News - World https://ift.tt/2Pl7vox
from BBC News - World https://ift.tt/2Pl7vox
Covid-19 variants pose 'real threat' to vaccine progress, CDC warns
![Covid-19 variants pose 'real threat' to vaccine progress, CDC warns]()
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March 01, 2021
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