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Scientists have found that the delta coronavirus strain was 5.7 times less sensitive to the sera of previously infected individuals and eight times less sensitive to vaccine sera compared to the usual version of the virus. About it reported at the University of Cambridge.
“There is evidence that neutralizing antibodies produced by previous infection or vaccination are less effective at stopping the delta variant,” study co-author Professor Ravi Gupta was quoted as saying.
According to the scientist, in India, where the strain was first discovered, in the first quarter of 2021, up to half of the cases of coronavirus were detected in people who in the past were infected with an earlier variant of the virus.
Scientists extracted serum from blood samples from people who had previously been infected with the coronavirus or vaccinated with the AstraZeneca and Pfizer vaccines. The researchers found that the delta virus was 5.7 times less sensitive to sera from previously infected individuals and 8 times less sensitive to vaccines. As the scientists explained, this means that it takes 8 times more antibodies from the vaccinated person to block the virus.
At the same time, an analysis of more than 100 infected doctors in three hospitals in Delhi, almost all of which were previously vaccinated, showed that the “delta” variant is transmitted between vaccinated to a greater extent than the “alpha” variant.
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