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

BEIJING, July 27 (Reuters) – 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, 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findings from a study of blood samples from healthy adults aged between 18-59 in a paper published on Sunday, which has not been peer reviewed.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.

Those…