Since COVID-19 vaccines began rolling out across the world, many scientists have been hesitant to say they can reduce transmission of the virus.
Early evidence from testing in animals, where researchers can directly study transmission, suggested immunization with COVID-19 vaccines could prevent animals passing on the virus. It found immunization with either the Pfizer or AstraZeneca vaccine reduced the chance of onward virus transmission by 40-60%. This means that if someone became infected after being vaccinated, they were only around half as likely to pass their infection on to others compared to infected people who weren’t vaccinated.
Watch more in iWantTFC These studies show vaccination is likely to substantially reduce virus transmission by reducing the pool of people who become infected, and reducing virus levels in the nose in people with breakthrough infections. Reducing the risk of transmitting the coronavirus relies on developing strong immunity against the virus. But immunity, even from the vaccines, fades over time. Scientists are actively monitoring people who’ve had COVID-19 vaccines to understand how long vaccine immunity is likely to last, and if and when booster shots will be required.
What’s more, companies like Moderna are developing updated vaccines to specifically target these variants, with positive early results.
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