Worried by the Delta variant, W.H.O. officials urged vaccinated people to keep wearing masks.
By BY RONI CARYN RABIN from NYT Health https://ift.tt/3x79Ep4
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Worried by the Delta variant, W.H.O. officials urged vaccinated people to keep wearing masks.
![Worried by the Delta variant, W.H.O. officials urged vaccinated people to keep wearing masks.]()
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