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Vaccinated people reduce the risk of nCoV infection by three times

New British research shows that people who get two doses of the vaccine are three times less likely to be positive for nCoV than people who have not been vaccinated.

The study by the Covid-19 surveillance program REACT-1, led by Imperial College London and Ipsos MORI, was based on analysis of test results of more than 98,000 people between June 24 and July 12. The results showed that unvaccinated people had a three times higher risk of infection than people who received full doses, with a rate of 1.21% and 0.4%, respectively.

Vials of AstraZeneca vaccine and injections are prepared at a vaccination site in Luton, England in March. Photo: AP.

The study added that if fully vaccinated people contract nCoV, they also have a lower risk of transmitting the virus to others, due to their small viral load.

“These findings suggest that two doses of the vaccine provide a good layer of protection against infection,” said Professor Paul Elliott, School of Public Health at Imperial College London.

In more than 98,000 test samples, scientists recorded 527 positive samples, equivalent to 0.63%. This number increased four times compared to the report published on June 17, made from May 20 to June 7, with a rate of 0.15%. The highest rate of viral infections was recorded in London, with 0.94%.

The results of gene sequencing of 254 out of 527 samples resulted in infection with the Delta variant. Warning about the threat from Delta, scientists say that even if restrictions have been eased, people should still act with caution to avoid the risk of nCoV infection and community transmission.

Thanh Tam (Follow Imperial College London, Guardian)


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