China’s decision to lock down the city of Wuhan, ground zero for the global COVID-19 pandemic, may have prevented more than 700,000 new cases by delaying the spread of the virus, researchers said Tuesday. Drastic Chinese control measures in the first 50 days of the epidemic bought other cities across the country valuable time to prepare and install their own restrictions, according to the paper by researchers in China, the United States and the UK, published in the journal Science. “Our analysis suggests that without the Wuhan travel ban and the national emergency response there would have been more than 700,000 confirmed COVID-19 cases outside of Wuhan by that date,” he was quoted as saying in a press release.