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Boosters less effective against more prevalent BA.2 subvariant: Dr Yong

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Booster shots provide 1.7 times less immunity against the Omicron BA.2 subvariant compared to the BA.1 subvariant, top virologist Dr Yong Poovorawan said on Friday.

In a Facebook post, Dr Yong said a recently conducted study shows that nearly all current Covid-19 patients in Thailand had been infected by the BA.2 subvariant.

The study, “Omicron BA.1, BA.2 and Covid-19 booster vaccination”, was published on Wednesday in the peer-reviewed Journal of Infectious Diseases.

His report also concludes that the mutation of the virus causes the immunity to drop slightly.

The study can be read at

Published : April 29, 2022