Health and Wellbeing

COVID-19 vaccines offer good protection against new infections 

scientist in a lab working with a vaccine

Posted on: 20 August 2021

A new study has shown that the Oxford-AstraZeneca vaccine, though initially less effective, offers the same levels of protection against coronavirus after four to five months as the Pfizer-BioNTech vaccine.

Both COVID-19 vaccines still offer good protection against new infections, but effectiveness is reduced compared with the Alpha variant. 

Research published this week by the University of Oxford and the Nuffield Department of Medicine looked at the impact of the Delta variant – the dominant variant in the UK now – and vaccine effectiveness. 

It found that two doses of either vaccine provides at least the same level of protection as having had COVID-19 before through natural infection. 

People who had been vaccinated after already being infected with COVID-19 had even more protection than vaccinated people who hadn’t had the virus. 

The study also found that the time between doses does not impact effectiveness in preventing new infections, but younger people have even more protection from vaccination than older people. 

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