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high quality apple developer account:Antibodies from Sinovac\u0027s Covid-19 shot fade after about 6 months, booster helps: Study

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BEIJING — Antibodies triggered by Sinovac Biotech's Covid-19 vaccine decline below a key threshold from around six months after a second dose for most recipients, although a third shot could have a strong boosting effect, according to a lab study.

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Chinese researchers reported the findings from a study of blood samples from healthy adults aged between 18-59 in a paper published on Sunday (July 25), which has not been peer reviewed.

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For participants receiving two doses, two or four weeks apart, only 16.9 per cent and 35.2 per cent respectively still had a level of neutralising antibodies above the threshold six months after the second dose, the paper said.

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Those readings were based on data from two cohorts involving more than 50 participants each, while the study gave third doses to a total of 540 participants.

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When participants in some cohorts were given a third dose, about six months after the second, neutralising antibody levels after a further 28 days had increased around three to five fold from the levels seen four weeks after the second dose, the study showed.

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The study was conducted by researchers at disease control authorities in Jiangsu province, Sinovac, and other Chinese institutions.

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Researchers cautioned the study did not test the antibodies' effect against more transmissible variants, and that further research was needed to assess antibody duration after a third shot. REUTERS  

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转载说明:本文转载自Sunbet。

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