China tightened lockdowns and increased orders for mass testing in cities along its coast Wednesday amid the latest surge in COVID-19 cases. Checks have been set up in toll stations around the city of Putian in Fujian province, with a dozen of them closed entirely. The nearby cities of Xiamen and Quanzhou have also restricted travel as the delta variant spreads through the region. The National Health Commission on Wednesday said an additional 50 cases had been diagnosed in various parts of Fujian, most of them in the Putian region. Since the start of the pandemic, first detected in late 2019 in the central Chinese city of Wuhan, China has imposed strict testing, lockdowns, quarantines and mask-wearing requirements. Fujian has seen at least 152 new cases in recent days, prompting stay-at-home orders and the closure of entertainment, dining and fitness venues, along with the cancellation of group activities, including those …