Sinovac Says 97% Rate Refers to Seroconversion in Indonesia

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Chinese vaccine maker Sinovac Biotech Ltd.’s coronavirus shot created antibodies among 97% of those administered with it in a final stage trial in Indonesia, said a company spokesperson on Tuesday.

Known as the seroconversion rate, this is separate from the vaccine’s efficacy, as a high seroconversion rate does not necessarily mean that the vaccine effectively protects people against Covid-19. Sinovac is still in the midst of determining its shot’s efficacy from final stage trial data, said the spokesperson.

Earlier, Iwan Setiawan, head of corporate communications at Indonesia’s state-owned company PT Bio Farma, told reporters that Sinovac’s shot had proven 97% effective in early trials there.

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