Why do other provinces have to stay at home for three days when they come to Huzhou?

The silent period of the evolutionary branch of Omicron BA.5.2 mutant in human body is about three days, in order to find the source of the virus and protect people who are not infected by the virus.

Huzhou is a prefecture-level city under the jurisdiction of Zhejiang Province, a central city in the Yangtze River Delta, an important city in the Shanghai-Hangzhou metropolitan area, a core city in Greater Bay Area around Hangzhou Bay, and a central city in the G60 Science and Technology Corridor. It is located in the north of Zhejiang, at the junction of Zhejiang, Jiangsu and Anhui provinces.