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Expert says herd immunity from Covid is ‘mythical’ with the delta variant

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LONDON — Achieving herd immunity with Covid vaccines when the highly infectious delta variant is spreading is “not a possibility,” a leading epidemiologist said.

Experts agree on several reasons why such a goal — where overall immunity in a population is reached and the spread of the virus is stopped — is not likely.

Sir Andrew Pollard, head of the Oxford Vaccine Group, told British lawmakers Tuesday that as Covid vaccines did not stop the spread of the virus entirely — with vaccinated people still able to be infected and transmit the virus — the idea of achieving herd immunity was “mythical.”

“I think we are in a situation here with this current variant where herd immunity is not a possibility because it still infects vaccinated individuals,” said Pollard, one of the lead researchers in the creation of the AstraZeneca-University of Oxford vaccine. ...

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