The basic conditions for virus transmission include the source of infection, the means of transmission and the susceptibility of the population, so virus infection can be prevented by isolating the source of infection, cutting off the means of transmission and protecting the susceptible population. 1. Isolation of the source of infection: patients infected with the virus can be isolated and actively treated to reduce the chance of transmission. 2. Cut off the transmission route: for respiratory infections, the virus can be prevented through the use of masks, and keep a distance from the source of infection; for fecal-oral transmission of the virus can be prevented by paying attention to dietary hygiene, hand hygiene, etc.; for sexually transmitted viruses, attention should be paid to the use of condoms; for the mosquito-borne viruses, mosquito prevention, mosquito control, etc.. 3. Protection of susceptible people: mainly the use of vaccines. If infected with the virus, you should seek medical treatment in time.