Recently, the overseas epidemic situation is still severe. Local epidemics have gradually appeared in some parts of the country. The prevention and control of the epidemic still cannot be relaxed. Kaiyi Technology is always ready. Class B infectious diseases in the "Law of the People's Republic of China on Prevention and Control of Infectious Diseases", but implement Class A management measures. The population is generally susceptible, mainly through respiratory droplets and close contact. If exposed to high concentrations of aerosols for a long time in a relatively closed environment, there is a possibility of aerosol transmission. As of 24:00 on May 31, there have been 221 countries and regions around the world with new coronary pneumonia epidemics, with a total of more than 171 million confirmed cases of new coronary pneumonia, and more than 3.55 million deaths. The top five countries with cumulative reported cases are the United States and India. , Brazil, France, Turkey.Preventive measures: inoculate the new coronavirus vaccine, do not gather, wearFace mask, Wash hands, open windows frequently, ventilate frequently, keep clean, cover your mouth when sneezing, and seek medical treatment early if you have symptoms.