The World Health Organization's chief scientist said that the coronavirus infections are rising across most regions of the world as the delta variant spreads, clear evidence that the pandemic isn't on the wane.
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Covid-19: WHO’s chief scientist warns against mixing and matching vaccines| Oneindia News
Oneindia
The World Health Organization's (WHO's) chief scientist Dr Soumya Swaminathan has warned against mixing and matching of Covid-19..
