Antibodies from Sinovac’s Covid-19 shot fade after about 6 months, booster helps: Study

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

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.