12 per cent of Americans may not need coronavirus vaccine because of previous exposure, US officials say

A Covid-19 vaccine that the Trump administration hopes will be available by January may not be equally effective for everyone, US officials said on Tuesday.But, they added, they expect as many as 40 million Americans to have developed coronavirus antibodies by the end of this year, which would lower the population that would need the treatment that officials hope will end the pandemic.“Operation Warp Speed”, an initiative under the auspices of the US Department of Health and Human Services (HHS…

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