All asymptomatic infected people in other counties have been there. As of August 1 1 day, 2022, according to the announcement of the epidemic prevention and control command center of Minquan County, Henan Province, epidemiological investigations showed that asymptomatic infected people in other counties were all from Yanggu Town, Qi County, Henan Province. They had activities in Minquan County on July 8, 2008 and June 9, 2009, and then returned to Qixian County. On the 20th, asymptomatic infected people from other counties came to Minquan County again. After leaving that day, nearly 100 people were positive in just one week, and all of them were asymptomatic.