1, source of infection: people or animals that can spread pathogens.
2. Transmission route: The route through which pathogens leave the source of infection and reach healthy people is called transmission route, such as air transmission, food transmission and biological vector transmission.
3. Susceptible population: people who lack immunity to an infectious disease are called susceptible population.
Extended data characteristics of infectious diseases;
Pathogens, infectious and epidemic, are often immune after infection. Some infectious diseases are seasonal or endemic. The classification of infectious diseases has not been unified, and can be classified according to pathogens or transmission routes. The prevention of infectious diseases should take comprehensive measures leading by cutting off the main transmission links.
The spread and prevalence of infectious diseases must have three links, and if one of them can be completely cut off, the occurrence and prevalence of this infectious disease can be prevented. The weak links of various infectious diseases are different. We should make full use of it in prevention. In addition to the leading link, measures should be taken for other links. Only in this way can we better prevent various infectious diseases.