Antibodies from Sinovac’s COVID-19 vaccine fade after about 6 months

Antibodies from Sinovac’s COVID-19 vaccine fade after about 6 months
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[Ed. – A new wrinkle in an increasingly messy situation.]

Antibodies triggered by Sinovac Biotech’s COVID-19 vaccine declined below a key threshold from around six months after a second dose for most recipients, although a third shot had a strong booster effect, according to a lab study.

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findings from a study of blood samples from healthy adults aged between 18-59 in a paper published on Sunday, which has not been peer reviewed.

Among participants who received two doses, two or four weeks apart, only 16.9% and 35.2% respectively still had neutralising antibodies above what researchers regard as a detectable threshold level six months after the second shot, 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 of the vaccine or placebo to a total of 540 participants.

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