Two doses of either vaccine still provided at least the same level of protection as having had COVID-19 before through natural infection, the Oxford-based researchers said.
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Delta Covid variant spreads just as easily by vaccinated as the unvaccinated, scientists find leicestermercury.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from leicestermercury.co.uk Daily Mail and Mail on Sunday newspapers.
The researchers, however, noted that with Delta, Pfizer-BioNTech vaccine and Oxford-AstraZeneca preventive, known as Covishield in India, still offer good protection against new infections.