Amebic dysentery (Entamoeba histolytica) epidemiology

Amebic dysentery (Entamoeba histolytica) is prevalent in the world, more prevalent in tropical and subtropical regions, but in colder areas, and even the Arctic Circle, there is also a prevalence of infection and amoebic. Its prevalence and the level of sanitation all over the state of the economy and is closely related to eating habits, it is estimated that about 10% of the world's people were infected, the infection rate in some places can be as high as 50%.

1. The source of infection: the chronically ill, convalescent patients and healthy persons with insect-borne disease is the sources of Amebic dysentery, a strong resistance to cyst in low-temperature and humid environment, can survive for more than 12 days, to live in the water 9 ~ 30 days. However, encapsulation of the dry, high temperature and chemical resistance of the weaker drugs, such as 50 ℃, short-term death, dry environment of the survival time of only a few minutes, in 0.2% hydrochloric acid, 10% ~ 20% of salt water and seasoning such assoy sauce, vinegar, can not long survive. 50% alcohol to kill them quickly.

2. Spread: Entamoeba histolytica is transmitted as follows:

1) cyst can cause water pollution in the area of the outbreak;
2) in feces as fertilizer, not washed and not cooked vegetables are also important spread factors;
3) finger cyst contamination, the spread of food or utensils;
4) flies and cockroaches can contact stool, and vomiting faeces carrying surface, the cyst and become an important food media.

3. infection features: Entamoeba histolytica disease published widely in the temperate regions, the disease may be prevalent from time to time, and in tropical and subtropical regions, and its prevalence is particularly acute. Its incidence varies with time and more in the autumn, followed by the summer. The incidence of more men than women, adults more than children, this may be related to ingestion of food containing cyst or age-related immune.