What are the epidemiological characteristics of endemic diseases, what are the epidemiological chara

The distribution of endemic diseases of biological origin is more closely related to the living habits of the host, so they have different characteristics in distribution zone, latitude and epidemic season.

The foci of biomass endemic diseases will shrink day by day due to social progress and economic development, but some biomass endemic diseases will also spread due to social factors such as convenient transportation and population movement, such as dengue fever and Legionnaires' disease, which have begun to introduce or threaten China. For example, there was no epidemic hemorrhagic fever in Xinjiang, but it became a new natural foci as the brown rat was brought to Hami, Daheyan and Urumqi through the flow of people.

Briefly describe the epidemiological characteristics of social diseasesA:Different from infectious diseases, social diseases are the result of the comprehensive action of multiple factors, and diseases have the phenomenon of "causal intersection", which is manifested as an epidemic pattern of multiple causes and multiple effects. The epidemic pattern of social diseases is characterized by the following characteristics:

1. Social stratification: The occurrence type, morbidity or mortality rate of social diseases are obviously different in different social classes.

3. Economic dependence: economic level plays a major role in the epidemic of social diseases.

4. Social customs.

6. Regional distribution.

Endemic diseases refer to the general term for biogeochemical diseases, natural epidemic diseases and diseases related to specific production and lifestyle that occur in a certain area.

Depending on the form of their existence, endemic diseases can be divided into two main groups:

Natural endemic diseases: Mainly affected by the natural environment in certain areas, some diseases exist only in these areas. Including: iodine deficiency disease, endemic fluorosis, endemic arsenic poisoning, etc.

Natural epidemic diseases: plague, brucellosis, etc.

What are the common endemic diseases? Endemic diseases are divided into 5 categories according to their causes, geochemical diseases, endemic parasitic diseases, diseases related to specific production methods and endemic diseases of unknown causes, among which endemic diseases of unknown causes, once identified**, will also be classified into the above four categories.

1。Geochemical diseases: iodine deficiency disease, drinking water fluoride disease, drinking water arsenic disease, endemic selenium poisoning, endemic acute barium poisoning (paralysis), etc.

2。Natural epidemic diseases: schistosomiasis, plague, forest encephalitis, brucellosis, etc.3.

Endemic parasitic diseases: malaria, filariasis, echinococcosis, etc.4. Diseases related to a specific productive lifestyle:

Coal-fired fluorosis, brick-drinking tea fluorosis, coal-fired arsenic poisoning, Kurul disease (caused by eating dead human brains), fever (gossypol poisoning caused by cottonseed oil consumption), botulism (mainly homemade soy products and other fermented food poisoning).

5。Endemic diseases with unknown causes: Keshan disease, large bone joint disease, stomach disease, black foot disease, etc.