The epidemic coronavirus is a newly discovered coronavirus, which was named SARS-Cov-2 by the International Committee for Virus Classification. Because people lack immunity to new virus strains, people are generally susceptible.

Caused by SARS-Cov-2 coronavirus, WHO named the diseases caused by SARS-Cov-2 infection as coronavirus pneumonia-19, and most of them can cause pneumonia, which is called novel coronavirus/COVID-19.

Coronavirus is an unsegmented single-stranded positive-stranded RNA virus, which is named because the virus envelope protrudes like a corolla.

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This virus is sensitive to ultraviolet light and high temperature. Lipid solvents such as 56℃ for 30 minutes, ether, 75% ethanol, chlorine-containing disinfectant, peracetic acid and chloroform can effectively inactivate the virus, but chlorhexidine cannot effectively inactivate the virus.

Transmission through respiratory droplets and close contact is the main route of transmission. In the case of long-term contact with high concentration aerosol in a relatively closed environment, it may spread through aerosol. Since novel coronavirus can be separated from feces and urine, attention should be paid to aerosol or contact transmission caused by environmental pollution of feces and urine.

Aerosol propagation refers to that fog drops lose moisture in the process of air suspension, leaving a nucleus composed of protein and pathogens, forming a fog drop nucleus, which can float to far places in the form of aerosol, resulting in long-distance propagation.