I. What are the common parasitic infections? In recent years, the strengthening of people’s health awareness in social life and the attention to diet and water hygiene in life have resulted in fewer and fewer parasitic diseases among residents living in cities, and even in rural areas, the incidence of parasitic infections has been declining, but not completely eliminated. At present, the common parasitic diseases mainly include roundworm infection, pinworm infection, hookworm infection, amoeba infection, whipworm infection, Plasmodium infection, trichuris infection, etc. In some areas, there are also beef or pork tapeworm infection, schistosome infection, liver fluke or lung fluke infection, etc. Can parasitic diseases be diagnosed if eggs are found in the stool? If eggs are found in the stool, it is certain that parasitic infection is present. However, when no eggs are found in the stool parasite test, it does not mean that parasitic infection can be denied. This is because eggs may not be detected in a single test due to improper fecal sampling or improper sampling time, or because the infected worms in the body have not yet ovulated or ovulated less or are male worms. In this case, the diagnosis should be confirmed according to the clinical symptoms and other examination methods. How to prevent parasitic infections? There are four main ways of parasitic infection 1. Due to unhygienic, eating or drinking vegetables, fruits, drinks, aquatic products, meat, etc. that are not cleaned or fully cooked, parasite eggs or even parasite larvae are ingested into the body. Such as the common roundworm, whipworm, lung fluke, liver fluke, ginger worm, pork tapeworm, beef tapeworm and so on. The main preventive measures are to eat clean food, especially directly imported food, meat and aquatic products must be processed and cooked before consumption. Do not drink raw water, especially unsterilized natural water sources.2. Infection through the skin such as hookworm microfilariae can enter the body through the skin, schistosomes can be due to improper use of water in areas where schistosomes are endemic, such as bathing in a pool of water, can enter the body through the skin infection. In endemic areas, special care should be taken not to expose the skin too much, not to walk barefoot and not to bathe in the pond. 3, infected by vector insects such as Plasmodium can infect the human body through mosquito bites, causing malaria. In addition, there are mosquito bites spread by the blood filariasis, by the bite of the white lacewing spread of black fever. Prevention methods are mosquito control and prevention of mosquito bites.4.Infection by contact such as Trichomonas vaginalis can be infected through sexual contact, but also due to the use of unclean shared bathing utensils and infection.