Insidethe white, bacteria-free walls of a new building on the southern outskirts-组卷网

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Inside the white, bacteria-free walls of a new building on the southern outskirts of Beijing, two employees wearing masks and rubber gloves are busy injecting a clear, colorless liquid into rows of small bottles.

The 215,000 square feet production plant was built in recent months specifically for producing a Covid-19 vaccine (疫苗) developed by Chinese pharmaceutical company Sinovac Biotech.

CoronaVac, the vaccine candidate from Sinovac, is part of China’s push to be at the forefront of rolling out immunizations (免疫接种) against the deadly novel coronavirus.

The Nasdaq-listed biotech company began developing its vaccine in late January, less than a week after Wuhan—the original epicenter of China’s coronavirus outbreak—went into a strict lockdown.

By June, China had largely contained the coronavirus, dealing with only a small number of outbreaks. Those newly reported Covid-19 cases in China didn’t meet the necessary conditions for a Phase 3 trial, so Sinovac reached an agreement with Brazil—which ranks second in the world for infections, with more than 3.6 million reported cases.

In cooperating with the Butantan Institute in Sao Paulo, a Phase 3 study was launched in late July involving 9,000 volunteers, all health professionals who have worked with Covid-19 patients but haven’t been infected with the virus.

The tests are ongoing, but Dimas Covas, president of the Butantan Institute, said Wednesday primary data shows CoronaVac developed immunity in 97% of the people vaccinated after two doses—a level he said was “fundamental to break the chain of transmission of the coronavirus.”

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