What the new Oxford-ONS study reveals about the effectiveness of Covid vaccines

Largest study of its kind suggests vaccinated people carry same levels of virus as the unvaccinated

Covid-19 vaccine
(Image credit: Leon Neal/Getty Images)

The effectiveness of the Pfizer--BioNTech vaccine declines faster than that of the Oxford-AstraZeneca jab - but neither reduces the amount of Covid-19 carried by a person once infected, according to a major new study.

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