(Photo by CHAIDEER MAHYUDDIN/AFP via Getty Images)
January 13, 2021
3:27 PM ET
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Brazil’s Butantan Institute released numbers calling into question the efficacy of China’s CoronaVac vaccine Wednesday, prompting China to respond in order to clarify the numbers.
Butantan is in final-stage trials for CoronaVac, a COVID-19 vaccine manufactured by China’s SinoVac, and submitted results to Brazilian regulators Tuesday declaring an efficacy rate of just over 50%, according to the South China Morning Post. A week prior, Butantan, a partner of SinoVac, submitted results indicating CoronaVac was 78% effective in preventing mild cases of COVID-19 and 100% effective in preventing severe cases, according to SCMP.