Entamoeba histolytica

Entamoeba histolytica (amebic dysentery) (entamoeba ihstolytica Schaudinn, 1930), the main parasite in the colon, or amebic dysentery caused by colitis. Amebic dysentery is enough to root worm gang of the most important pathogenic type, under certain conditions, and may extend until the liver, lungs, brain, the genito-urinary system and other parts of the body to form ulcers and abscesses. 】 【Epidemiology of the disease prevalent in the world, more popular in tropical and subtropical regions, but in colder areas, and even within the Arctic Circle are also popular and amoebic infection. Its rate of infection with high and low all over the environmental health, economic status and eating habits are closely related, it is estimated that about 10% of the world's people affected by pollution in some places infection rates can be as high as 50%. In China's rural areas than in urban distribution in general, in recent years because of my health situation and living standards, acute abscess cases of amoebic dysentery and, in addition to individual regions, have been rare, mostly scattered in the distribution of chronic or prolonged typical And cases with those insects. I source of infection: chronic disease, the health and recovery of patients with insect-friendly source of infection of the disease, cysts strong resistance in the low-temperature and humid environment, can survive for more than 12 days in water can live 9 ~ 30 days. But the cyst on the dry, high temperature and chemical resistance of the weaker drug, such as 50 ℃, that is, short of death, dry environment, the survival time of only a few minutes, 0.2 percent in the hydrochloric acid, 10% to 20% of the salt water and soy sauce , And vinegar in the condiments can not survive for a long time. 50% of alcohol can kill rapidly. Ii route of transmission: Entamoeba histolytica mode of transmission of the following: ① cysts can cause water pollution in the area of the outbreak; ② in the feces as fertilizer, not to wash and not cooked vegetables are also important The spread of factors; ③ cyst finger pollution, food or utensils and dissemination; ④ flies and cockroaches can contact with stool, vomit and faeces carrying the body surface, food cysts will become an important media. Iii popular 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, the epidemic situation is particularly serious. In the liberation of our country, all over the amoeba infection rate decreased significantly, such as the capital of Beijing Hospital from 1973 to 1978, examined a total of 38 075 cases, the positive rate was 0.52 percent; Fujian Medical University in 1976 Hoi An examination of 216 cases of children, the positive rate of 4.63% ; North East School of Medicine report period Jia-Mu (1980), check the outskirts of 487 cases of secondary school students, the positive rate was only 0.4 percent; Yueqing in Zhejiang Province in 1979, a survey of farmers in addition to 557 cases, the positive rate of 3.2 percent. The incidence of changing to autumn, followed by the summer. The incidence of men than women, adults more than children, this may be related to eat food containing the cysts or age-related immune.