1, Leishmania donovani
The life history of Leishmania donovani is divided into two stages: the first flagellate stage and the second flagellate stage. The former is parasitic in the digestive tract of arthropods, while the latter is parasitic in the cells of mammals or reptiles and spread by white maggots.
Kala-azar is caused by Leishmania donovani. Leishmania donovani flagellates are mainly parasitic on macrophages in organs such as liver, spleen, bone marrow and lymph nodes, and often cause systemic symptoms such as fever, hepatosplenomegaly, anemia and nosebleeds. In India, patients' skin often has dark pigmentation and fever.
2, hookworm
Hookworm is the general name of hookworm, and its morphological characteristics are developed oral sac. Hookworm is the most harmful caterpillar parasitic in human digestive tract. Due to hookworm parasitism, it can cause long-term chronic blood loss, leading to anemia and anemia-related symptoms in patients.
Hookworms are distributed all over the world, especially in tropical and subtropical regions. Human infections are more common. It is estimated that the number of hookworm infections worldwide is about 900 million. In China, hookworm disease is still one of parasitic diseases that seriously endanger people's health.
3. Filariasis
Filariasis is a parasitic nematode transmitted by blood-sucking arthropods. Adults parasitize the lymphatic system, subcutaneous tissue, abdominal cavity and thoracic cavity of the last host of vertebrates. The female lays eggs and produces sheathed or unsheathed microcapsules. Most microfilaments appear in blood, and a few appear in intradermal or subcutaneous tissue.
Larvae develop in the intermediate hosts of some blood-sucking arthropods. When these intermediate hosts suck blood, the infected mature larvae will escape from their beaks and penetrate the skin.
4. schistosomiasis
Schistosoma japonicum is divided into Schistosoma japonicum, diplococcus, Schistosoma japonicum and Schistosoma japonicum. Adults parasitize in mammals (including humans) and develop into adults.
In blood vessels, it is also called schistosomiasis or schistosomiasis. There are six kinds of Schistosoma japonicum, namely Schistosoma japonicum, Schistosoma mansoni, Schistosoma intermedia, Schistosoma Mekong and Schistosoma malayi. Schistosomiasis caused by Schistosoma japonicum, Schistosoma aegypti and Schistosoma mansoni is the most common and harmful.
Schistosomiasis mainly distributes in Asia, Africa and Latin America. Schistosomiasis is very common in China. Typical eggs of Schistosoma japonicum (B.C.163) were found in the female corpse of Mawangdui in Changsha, Hunan Province and the male corpse of Jiangling in Hubei Province, which confirmed that schistosomiasis had been prevalent in China for more than 2 160 years. A year ago.
5. plasmodium
Plasmodium is the lowest and most primitive protozoa. Although their whole body consists of only one cell, it is the chief culprit of malaria.
There are many kinds of plasmodium, which are found all over the world, but there are three kinds of plasmodium in China: Plasmodium vivax, which causes malaria to attack every other day; Plasmodium vivax, which causes malaria to attack every three days; Plasmodium falciparum causes irregular malaria cycles.
Baidu Encyclopedia-Five Parasites
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