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There are three types of human parasites:
1. Protozoa: Protozoa are single-celled organisms that can multiply in humans. These parasites can spread through contaminated food and water, person-to-person contact, and insect bites. Protozoa include Plasmodium malariae, which causes malaria infection, and Cryptosporidium, which is ingestible.
2. Helminths: Helminths are parasitic worms that often root in a person’s digestive tract. These parasites cannot multiply or divide within a human body and eventually pass through a person’s stool. These include Ascaris lumbricoidesTrusted Source and hookwormTrusted Source parasites.
3. Ectoparasites: Ectoparasites are small organisms that live on the outside of the body. These include ticks, fleas, and lice.