Does Daozhen need to be isolated when he returns to Chongqing?

No need. According to the requirements of epidemic prevention in Chongqing, as of June 7, 2022, it has been verified that Daozhen and Chongqing belong to low-risk areas. According to the epidemic prevention policies of the two places, you only need to hold a 48-hour negative nucleic acid certificate from Daozhen to Chongqing, and you don't need to be isolated. You should take personal protective measures according to the epidemic prevention policy when you travel. Daozhen Autonomous County is an autonomous county under the jurisdiction of Zunyi City, Guizhou Province, and Chongqing is a provincial administrative region and municipality directly under the Central Government of China.