A training across three provinces and six cities triggered a domestic epidemic. Where is the source?

Recently, many people in Yingkou, Liaoning Province and Lu 'an, Anhui Province have tested positive for nucleic acid, including Anhui 16 and Liaoning 18. In this infectious incident, the reporter and the relevant staff of the health department conducted a detailed investigation on all the people who were killed and contacted, and found that this incident was because many people's awareness of epidemic prevention and control has gradually relaxed and they are no longer so nervous; Second, the virus inspection mechanism in some areas has its own problems, and the inspection process is full of loopholes and not strict enough, which leads to the large-scale spread of the epidemic.

At first, two photographers from Lu 'an, Anhui Province, Zhang, Li and Lu went to Yingkou, Liaoning Province to attend the photography conference. During this period, almost all participants did not wear masks, nor did they register for nucleic acid testing and scan health codes. During the meeting, many people had a headache and fever at that time, but no one paid attention to this matter and simply went to a nearby hospital for infusion. Later, Zhang also felt fever and headache at that time, so he also went to the clinic for infusion treatment. After the press conference, the three directly returned to Anhui without much thought. Horribly, the doctors in this clinic diagnosed asymptomatic infection shortly after these three people returned home, but at this time, these three people still knew nothing about it. After that, Zhang and other three people went to the hospital for infusion. In this case, it is reasonable to say that it should be isolated directly, but the local hospital did not do so, and still let these three people go out shopping and live a normal life until these three people were suddenly diagnosed as nucleic acid positive.

At present, the only thing we know about this infectious incident that spans three provinces and six cities is that the source of infection should be Yingkou, Liaoning, but there is no clue as to who the patient No.0 is. In the whole process, all the epidemic prevention and control processes are problematic. First, people attending the conference did not wear masks and did not register; The hospital didn't detect and isolate the patients' nucleic acid in time, and even didn't measure their temperature just because they claimed that they didn't have a fever. However, our citizens' awareness of prevention and control began to decline, and the vaccination rate in COVID-19 was also very low. At present, the epidemic situation in China has not been completely ruled out, and the disease is not completely curable. To achieve group immunization, China's vaccine planting rate must be higher than 80%, and there is not even 30% at present. In this case, it is impossible to rely solely on strict defense and import foreign defense. At present, the prevention and control of COVID-19 epidemic still needs the active cooperation and joint efforts of the broad masses of the people.