CoronaVac efficacy at 50-90% in Brazilian trial, says Sao Paulo official
RIO DE JANEIRO, December 25 (Reuters). The CoronaVac COVID-19 vaccine developed by China's Sinovac Biotech Ltd showed between 50% and 90% effectiveness in Brazilian studies on Wednesday.
The results of studies in Brazil are known only to the biomedical research center of the Butantane Institute of the state of Sao Paulo, which has an agreement with Sinovac to manufacture the vaccine, said Health Minister Jean Gorinchteyn.
Initial studies showed an effectiveness of over 50%, the minimum required by the Brazilian health authority Anvisa, and under 90%, said Gorinchteyn in an interview with CBN Radio, which was broadcast late Thursday.
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At Sinovac's request, the Sao Paulo Health Department did not receive the full study results from the Chinese drug manufacturer. The company will review the data before the final results are released.
On Wednesday, Butantane declined to provide the effectiveness rate from a study of 13,000 volunteers, citing its contractual obligations with Sinovac, and raised questions about transparency.
The CoronaVac vaccine showed 91.25% effectiveness in Turkey, it was announced Thursday that preliminary data are available from a late-stage study in the country.
(Reporting by Sabrina Valle editing by David Goodman)
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