A study published by a large number of US health workers has found that messenger RNA Covid vaccines 66 per cent effective against Delta. These vaccines include Pfizer and Moderna, which have been administered to the majority of people, that had previously claimed to have 91 percent efficacy rate.

Study finds that Pfizer, Moderna COVID-19 vaccines only 66% effective against Delta variant

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Study finds that Pfizer, Moderna COVID-19 vaccines only 66% effective against Delta variant