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A person receives the second dose of Sinovac s Covid-19 vaccine at the Bang Khun Thian Geriatric Hospital in Bangkok, Thailand on April 21, 2021. - Reuters
BANGKOK (The Nation/ANN): The Sinovac vaccine provides as much as “99.4 per cent immunity against Covid-19 a month after the second dose”, Chulalongkorn University virology specialist and chief of the Centre of Excellence in Clinical Virology Dr Yong Poovorawan said in a Facebook post on Thursday (April 22).
He was citing a study on immunity by the centre and Banphaeo General Hospital in Samut Sakhon.
Researchers studied the immunity of people before and after they received two doses of the Chinese vaccine, administered three weeks apart. ....

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