A Chinese coronavirus vaccine has been found to have a lower efficacy rate than previously publicized, and now regulators around the world are expected to closely scrutinize the vaccine before approving it for their countries.
The 50% efficacy rate is lower than the 78% number that was released by Brazil’s Butantan Institute on January 7, 2021. A series of confusing releases prompted calls from the scientific community for transparency in releasing coronavirus vaccine data.
On Wednesday, Sinovac Biotech chairman Yin Weidong insisted that the data showed the vaccine, called CoronaVac, was safe and effective.
He pointed out that the Brazilian study included people with “very mild symptoms” an
Jan 14, 2021