Parasites and their products are all foreign bodies to the host, which can cause a series of reactions, that is, the host's defense function. Its main performance is immunity. The host's immunity to parasites is a response of the immune system to recognize and clear the parasites, some of which are defensive responses. For example, the stomach acid of the host can kill some parasites that enter the stomach. Some reactions appear to limit, surround and even destroy the insects in the tissue. The immune response is the main manifestation of the host's effect on the parasite, including non-specific immunity and specific immunity.
The results of the interaction between the host and the parasite can be generally classified into three categories:
â‘ The host has cleared parasites and can defend against reinfection.
â‘¡The host has cleared most or failed to clear endoparasites, but it has relative resistance to reinfection. In this way, the host and the parasite maintain a long-term parasitic relationship, which is found in most parasitic infections or carriers.
â‘¢ The host cannot control the growth or reproduction of the parasite, and shows obvious clinical symptoms and pathological changes, which cause parasitic diseases. If it is not treated in time, the severe ones can die. Medical Education | Net collection and finishing.
In short, the relationship between the parasite and the host is extremely complex. Any factor can neither be regarded as isolated, nor should it be overemphasized. Understanding the nature of the parasitic relationship and the interaction between the parasite and the host is to understand the occurrence and development of parasitic diseases. The foundation is the basis for the prevention and treatment of parasitic diseases.
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