Antibodies from Sinovac's COVID-19 shot fade after about 6 months, booster helps - study

Antibodies triggered by Sinovac Biotech's (SVA.O) COVID-19 vaccine declined below a key threshold from around six months after a second dose for most recipients, but a third shot had a strong booster effect, a lab study showed. 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findings from a study of blood samples from healthy adults aged between 18-59 in a paper published on Sunday, which has not been peer reviewed