Q: In the investigation report, does not consider air transmission as the main mode of transmission indicate that the prevention and control methods can be more clear?
A: There are two main modes of respiratory tract transmission: droplet transmission and air transmission, that is, aerosol transmission. Air transmission is that the small particles formed by the virus discharged by the infected person in the air can stay in the air for a long time, or even spread with the air for a long distance. According to the report, there are two main routes of transmission: droplet transmission and contact transmission. In contact transmission, there is mainly close contact transmission. There is no evidence of air transmission, but there is no evidence to completely deny the existence of such transmission. But even if it exists, its function and place are limited. For the general public, its dissemination value is not great.
Now, it is correct and effective to take measures to block the spread, such as isolation, wearing masks and washing hands frequently. I hope that we will not panic excessively and take protective measures excessively.
Q: Family communication and close contacts tracking also have statistical data, which will guide the next step of prevention and control?
A: The data of family communication is 78% - 85%, which is based on the investigation in Guangdong and Sichuan. The interventions and prevention and control measures we have taken have blocked the continuous community communication. The patients are mainly in the family, which proves that the prevention and treatment effect is better. In the family, we need to take the right way, ventilate, disinfect and send the fever patients to the doctor in time.
The data of close contacts is 1% - 5%, which is also obtained through our investigation in Guangdong and Sichuan. Now it is necessary and correct for us to track and manage the close contacts of the patients who are diagnosed, suspected or febrile. If we dont manage tracking, 1% - 5% of patients will become mobile infectious sources. Early detection, early treatment and intervention can be carried out to improve the cure rate.