According to news reports, more than 3,000 teachers and students of Zhejiang Wanli University were closed-loop transferred to centralized isolation points overnight because of two positive infection cases. It is reported that on April 12 and April 13, two cases of positive infection were reported in Jinzhou District, Zhejiang Province, both of which were senior students of Zhejiang Wanli University, and the second case was a close contact of the first case.

So, how did this campus epidemic come about?

According to the official report, after the first infected person appeared, the relevant departments conducted nucleic acid tests on more than 20,000 teachers and students in two campuses of Wanli University, and the results were all negative, indicating that the viruses of these two students were not infected in the school, otherwise the whole school would not only have these two positive cases, but also find them among close contacts. The report shows that the activity tracks of case 1 and case 2 involve two companies outside the school, roadside convenience stores, Ruixing coffee shops and other places. Case 2 also took the high-speed train to Taizhou, and the virus was probably infected when they were outside. At present, it is only known that case 2 is the secret connection of case 1, and it is not clear who infected whom.

In fact, the school is relatively closed, the channels of contact with the outside world are relatively simple, and the control is relatively simple. Students rarely move across regions. However, the graduation season is coming soon, and many senior students are facing employment problems, and may need to go out for internships and interviews. It has made it more difficult for the school to prevent and control the epidemic.

At present, there are basically only two transmission points around the epidemic, one is the contact between people and the other is the contact between people and things. For schools, interpersonal contact means that students, teachers and other staff members do not pay attention to protection in external contact and are infected by viruses. The contact between people and things is that people contact with viruses existing in the environment or things, causing their own infection and then passing it on to others. In addition, people come into contact with things that enter the school, such as express delivery and other items. In school, people are concentrated, and young students account for the majority. Their online shopping volume is very large, and a large number of couriers enter the campus every day.

These are all possible ways for the virus to spread.