Turkish Researchers Downgrade Sinovac’s COVID-19 Vaccine Efficacy Rate

More than two months after Turkey granted emergency approval for the COVID-19 vaccine made by China’s Sinovac Biotech, Turkish researchers have revised the efficacy rate of the shot in preventing COVID-19 to 83.5 percent from 91.25 percent based on finalized phase 3 data.

The vaccine, known as CoronaVac, did stay at 100 percent efficiency in preventing hospitalization and severe illness, however. No deaths were seen in the Turkish trials, which enrolled 10,216 participants.

Worldwide trials of the shot have shown wide variations in efficacy rates, and the company has faced criticism for a lack of transparency regarding its trial findings.