Most scientists believe China’s decision to end its zero-COVID policy was long overdue. But now they have a new worry: that the country is collecting and sharing far too little data about the rough transition to a new coexistence with the virus.
China abruptly dropped virtually all controls a month ago, after protests, a sagging economy, and the extreme transmissibility of the virus’ latest variants made clinging to zero COVID untenable. Now, “SARS-CoV-2 has an open goal in front of it: a population with very low levels of standing immunity,” says evolutionary biologist Edward Holmes of the University of Sydney.
The China Center for Disease Control and Prevention put the number of confirmed cases the last week of December 2022 at more than 35,000—a fraction of the official number in the United States. But leaked notes from an internal meeting suggest a very different reality: The agency was told that almost 250 million people in China—roughly 18% of the population—may have caught COVID-19 in the first 20 days of December.
A major worry is that the wave will breed a new and even more troublesome SARS-CoV-2 variant. “It’s possible that something might be emerging, because there is such a big population in China,” says George Gao, who in July 2022 stepped down as head of China CDC but is now helping track circulating variants. But, he told, “There are no novel mutants—yet.” At a 20 December press briefing, Xu Wenbo, head of the National Institute for Viral Disease Control and Prevention, explained that the BA.5.
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