Recently, eight people infected with the novel coronavirus pneumonia have appeared in the Kanhaixuan community of Dongjiang Port District, Tianjin. In response to this epidemic, at the 155th New Coronavirus Pneumonia Prevention and Control Work Press Conference held today in Tianjin, Tianjin Zhang Ying, deputy director of the CDC, announced the virus retrospective results of the community.

After a video investigation, it was finally found that the

first case of Wang who tested positive for the nucleic acid of the new crown virus did not wear a mask in the elevator, and coughed and sneezed, which eventually led to the spread of the virus in the community.

Two communication chains in Haixuan District

  In Kanhaixuan Community, the epidemic was mainly concentrated in Building 4 and Building 19. Among them, Building 4 was the first building where Wang Mou, who was tested positive for the new coronavirus nucleic acid in Kanhaixuan Community, lived. 4 infected persons.

  In addition, 4 infected persons also appeared in Building 19, which has nothing to do with the new coronavirus infection.

Analysis of Infection Chain in Building 4 of Kanhaixuan Community

  On November 9, the company of the infected person Wang organized him to carry out a nucleic acid test. In the morning, Wang first entered the elevator of Building 4. He did not wear a mask in the elevator and was still coughing inside.

  Less than two minutes after him, one minute and 55 seconds, Kang's family of three walked into the elevator.

Coughing will produce droplets. The droplets will settle in the air for a long time, but the droplets will not settle for more than 1 minute. After such a short period of time, when a Kang family enters the elevator, there may be aerosols and The droplets that did not settle caused Kang's infection.

The more critical detail here is that Kang did not wear a mask. If Kang was wearing a mask at that time, this situation might prevent him from being infected and the probability of infection would decrease. Unfortunately, Kang did not wear it when he entered the elevator. Of masks.

The epidemiological connection between Kang and Wang is connected in series.

How is the communication between Building 4 and Building 19 related?

Through epidemiological investigations, it was found that there was a crossing of people in Building 9. In Building 9, there were co-workers of the infected person Wang in Building 4, and colleagues of Shen who worked in Building 19.

  Police officers and disease control personnel have been awake for two consecutive nights, and finally found a clue:

Wang, the first infected person found in Building 4, went to visit him on the night of November 9, and he went to look for him in Building 9 colleague.

Not only did he stop by, he also made small movements in the elevator, not only coughing, but also sneezing, without wearing a mask.

On November 10, Shen took the elevator to the 9th building to find his colleague, and then returned to the 19th building. On the afternoon of the 10th, Shen's colleague who lived in the 9th building had dinner in the 19th building.

  According to testing, the sample of the elevator surface in Building 9 tested positive for the new coronavirus nucleic acid, and it was positive at multiple points.

Analysis of Infection Chain in Building 19 of Kanhaixuan Community

  Shen’s colleague who lives in Building 9 travels back and forth between Building 19 and Building 10. Because this is Shen’s boss, and his company is located in Building 19, it is likely that his hands may be contaminated or otherwise. The pollution mechanically brought the virus to Building 19, and at the same time, Shen himself kept going back and forth between Building 9 and Building 19.

  This epidemic has brought us great inspiration. We must insist on wearing a mask. This winter, when you enter a confined space like an elevator, you must wear a mask.

Second, after returning home from a public place, the first thing is to disinfect the hands.

Third, pay attention to hygiene and etiquette, and don't spit.

  (CCTV reporter Sun Qiang Wang Xiaopei Wang Jinglei Han Ruxu Wang Zixin)