On the morning of 20 19, 12 and 3 1, National Health Commission experts arrived in Wuhan to carry out relevant testing and verification work. The survey found that most cases of pneumonia were business owners of South China Seafood City.
On June 5438+1 October1day, 2020, Wuhan Jianghan District Market Supervision Administration and Wuhan Jianghan District Health and Wellness Bureau issued the Announcement on Closing the Market. Take measures to close the seafood wholesale market in South China, and further strengthen the disease prevention guidance and environmental sanitation management in public places, especially farmers' markets in the city.
65438+1October 7th 2 1, a novel coronavirus was detected in the laboratory, and the whole genome sequence of the virus was obtained. By nucleic acid detection method, 15 cases were detected as novel coronavirus positive, and the virus was isolated from 1 case positive patients, which showed typical coronavirus morphology under electron microscope. The expert group believes that the pathogen of this unexplained viral pneumonia case was initially identified as novel coronavirus.
Transmission routing
The main transmission routes in novel coronavirus are respiratory droplet transmission and contact transmission, while the transmission routes such as aerosol and fecal mouth need to be further clarified. Epidemiological investigation shows that most cases can be traced back to the close contacts of the confirmed cases.
1, direct transmission
Refers to the infection caused by sneezing, coughing, talking droplets, and direct inhalation of exhaled gas at close range;
2. Aerosol transmission
Refers to the fog droplets mixed in the air to form aerosol, which leads to infection after inhalation;
3. Contact transmission
It means that droplets are deposited on the surface of articles, and then contact with mucous membranes such as mouth, nose and eyes after contacting contaminated hands, leading to infection.
4, mother-to-child transmission
The mother who tested positive for COVID-19 virus may have transmitted the virus to her baby through the placenta, and COVID-19 virus may also actively replicate in placental cells.
Refer to the above content: Baidu Encyclopedia-novel coronavirus Epidemic in 2020