Parasites are pathogenic lower eukaryotes, which can be used as pathogens or carriers of diseases. Parasites are characterized by all living things in or attached to the host for nutrition or shelter for their survival, development or reproduction. Many small animals live in a parasitic way and attach themselves to larger animals.

Parasites can change the behavior of the host to achieve better reproduction and survival. If human beings are infected with some parasites living in the brain, such as Toxoplasma gondii, which lives in the brain all their lives, then human response ability will be reduced.

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growing environment

The human body is an ideal breeding habitat for parasites parasitic on the human body. They can enter the human body through air, drinking water, food and direct contact. Within 30 minutes, they can find their own habitat.

People's skin will be attacked by tiny insects such as mites. Human digestive tract is an ideal habitat for pork tapeworm and beef tapeworm. If parasites enter the human circulatory system, on the one hand, they can attack white blood cells, on the other hand, they can reach organs such as lung and liver or block blood vessels or lymphatic vessels, which will cause diseases such as cirrhosis, portal hypertension and elephantiasis.

Parasitism is a specific relationship between parasites and hosts under certain conditions. Parasites enter the host, causing different degrees of damage to the host; At the same time, the host's response to parasites is to produce different degrees of immunity and try to get rid of it. Therefore, parasites may cause morphological and functional changes, and the host may undergo pathological changes.

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