Parasites - Definition

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Parasites are small living organisms that belong to animal, vegetable, bacterial, or fungal species, living or multiplying inside the host organism in order to survive. There they feed and reproduce, which can cause mild to severe conditions for the host body. Sometimes, parasites can be beneficial for the body, in which case it is called symbiosis. There are different types of parasites that can be found in humans, such as some belonging to the arthropod species like fleas, cestodes, or nematodes; worms like tapeworms that colonize the digestive tract; and sometimes single-celled organisms like plasmodium that colonize the liver and blood, responsible for the spread of malaria.