On the evening of July 31st, Zhengzhou City, Henan Province held a press conference on the prevention and control of the new crown pneumonia. Wang Wanpeng, secretary of the party group of the Zhengzhou Municipal Health Commission, notified at the press conference that as of 18:00 on July 31, 11 confirmed cases of new crown pneumonia had been found in Zhengzhou , 16 people were asymptomatic infected.