Two covid-19 vaccines are 15 per cent less effective against delta
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Two covid-19 vaccines are 15 per cent less effective against delta

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By Michael Le Page

A nurse administers a dose of the Pfizer Covid-19 vaccine to a college student during a City of Long Beach Public Health Covid-19 mobile vaccination clinic at the California State University Long Beach (CSULB) campus on August 11, 2021 in Long Beach, California. - Students, staff, and faculty at the California State University (CSU) and University of California (UC) system schools will be required to be fully vaccinated in order to attend in-person classes. All teachers in California will have to be vaccinated against Covid-19 or submit to weekly virus tests, the state's governor announced June 11, as authorities grapple with exploding infection rates. (Photo by Patrick T. FALLON / AFP) (Photo by PATRICK T. FALLON/AFP via Getty Images)

A nurse administering a dose of the Pfizer covid-19 vaccine

PATRICK T. FALLON/AFP via Getty Images

Two doses of either the Pfizer/BioNTech or Oxford/AstraZeneca vaccines provide good protection against symptomatic infections by the delta coronavirus variant, but both vaccines are around 15 per cent less effective against delta than against the alpha variant, according to a large study in the UK. The findings also show a waning of protection over time, and imply that vaccinated people who do get infected might be just as infectious as unvaccinated people.

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