What symptom does hookworm infection have

summary

Hookworm is the general name of hookmouth nematodes, and the well-developed oral sac is its morphological feature. Among the nematodes that parasitize human digestive tract, hookworm is the most harmful. Due to the parasitism of hookworm, the human body can lose blood for a long time, resulting in anemia and anemia related symptoms. Let's take a look at the following.

What symptom does hookworm infection have

First, hookworm is a worldwide distribution, especially in tropical and subtropical areas. It is estimated that there are about 900 million hookworm infected people in the world. In China, hookworm disease is still one of the most serious parasitic diseases.

Second, composition. Because the front end of the body is bent to the back, the upper edge of the mouth sac is ventral and the lower edge is dorsal. The oral sac of Ancylostoma duodenalis is oblate and oval. There are two pairs of hooking teeth on its ventral margin. The outer teeth are generally larger than the inner teeth. The dorsal center has a semicircular deep concave, and the two sides are slightly protruding. The oral sac of Ancylostoma Americana is oval.

Third, there is a pair of plate teeth on the ventral margin and a conical sharp tooth on the dorsal margin. The length of the pharyngeal tube of hookworm is about 1 / 6 of the body length, and its posterior end is slightly enlarged. The intestinal wall is thin and consists of a single layer of epithelial cells, with microvilli on the inner wall, which is conducive to the absorption and diffusion of oxygen and nutrients.

matters needing attention

According to the shape of the body and the characteristics of the mouth sac, the shape of the copulatory umbrella of the male and the shape of its dorsal radial rib branches and copulatory spines, the presence or absence of the tail spines of the female and the position of the vulva, etc., the morphology of hookworm duodeni and hookworm Americana is described.