About 460,000 residents living along Zhongnan street in south China's Guangzhou City are now quarantined at home after the street was declared a high-risk area and put under lockdown on June 1. In order to fulfill the residents' basic needs, local authorities have launched a mini app called "supply guarantee zone." In addition to food like rice, meat and vegetables, people can also purchase milk powder, diapers and other infant products online through the app. People with chronic diseases who need to buy specific drugs regularly can report to community staff members to get help. The city has registered a total of 77 infections as of Thursday, including 13 asymptomatic cases.