According to the US Centres for Disease Control and Prevention (CDC), vaccines were more effective at fighting the Delta variant in the United States than the Omicron variant while comparing the rate of hospitalisations among adults.

Vaccines were more effective against Delta variant, CDC study finds

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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vaccine effectiveness-against-delta-variant

Vaccines were more effective against Delta variant, CDC study finds

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