The characteristics of parasites are: parasitism, that is, in the host or in the host or attached to the outside world to obtain and maintain its survival. All living things that need nutrition or shelter to develop or reproduce parasites. Many small animals live in a parasitic way and attach themselves to larger animals. Broadly speaking, viruses are also parasites.

Parasitic characteristics: from natural life to parasitic life, parasites have gone through a long process of adapting to the host environment. Parasites adapt to the parasitic environment for a long time and lose their ability to live independently to varying degrees. The stronger the dependence of parasites on nutrition and space, the weaker their ability to live independently. The longer the parasitic life history, the stronger the adaptability and dependence, and parasites can only selectively parasitize on a certain host or a certain type. This selectivity of parasite to host is called host specificity, which actually reflects the enhancement of parasite's adaptability to parasitic environment.

Precautions: Wash your hands before and after meals, pay attention to personal hygiene and take a bath frequently. Cook meat and seafood thoroughly. Drinking water should be boiled thoroughly. For example, Toxoplasma gondii is infected by undercooked meat. Eliminate mosquitoes and other insects that spread diseases. Seek medical attention immediately after infection with parasites. For example, the treatment of sleepiness, early treatment is the key to rehabilitation. ?