Chapter 1 Prevention and Control Plan of Corona Virus Disease 2019

(Fourth Edition)

The 2019-nCoV belongs to the genus β coronavirus and has distinct genetic characteristics from SARSr-CoV and MERSr-CoV. Coronaviruses are sensitive to ultraviolet rays and heat, and can be effectively inactivated when environmental temperature is 56 °C and lasts for 30 min, and lipid solvents such as ether, 75% ethanol, chlorine-containing disinfectant, peroxyacetic acid and chloroform except chlorhexidine. Based on current epidemiological investigations, the incubation period of COVID-19 is 1 to 14 days, and generally within 3 to 7 days. At present, the major source of infection is the COVID-19 patients, and asymptomatic 2019-nCoV carriers can also be the source of infection. The main routes of transmission are respiratory droplets and contact, while aerosol and fecal-oral transmission routes are yet to be verified. Humans of all ages are generally susceptible.

To better promote COVID-19 prevention and control work nationally,strengthen coordination of COVID-19 prevention and control institutions,complete the epidemic information monitoring and report, achieve“early detection, early report, early diagnosis, early quarantine and early treatment”, decrease the spread of this epidemic, reduce morbidity and mortality, improve people’s life safety and health, and maintain social stability, the fourth edition of Prevention and Control Plan of Corona Virus Disease 2019 is updated and formulated on the basis of the third edition according to the fact that COVID-19 has been classified into the Class B communicable diseases and managed as a Class A communicable disea ses,and the development of national epidemic, case epidemiology and clinical research.