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Pfizer, AstraZeneca Covid vaccines less effective against Delta variant: Oxford-led study

Pfizer vaccine s effectiveness against Delta variant declines faster than AstraZeneca

Coronavirus: Delta Gives Vaccinated People Same Virus Amount As Unvaccinated: Study

Vaccines against Covid-19 are less effective against the delta variant, a large U.K. study showed in results that may fuel a push for booster shots for fully vaccinated people.

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