Who are the 4 1 population of Baoji epidemic?

Medical personnel, immigration, customs, front-line personnel of market supervision system, etc. Baoji, known as Chencang and Yongcheng in ancient times, is known as "the hometown of Emperor Yan and the hometown of bronzes". However, the 4 1 population of Baoji epidemic refers to medical personnel, front-line personnel of entry and exit, customs and market supervision system. Because these people have a high risk of contact and transmission in COVID-19.