Parasite Infections Symptoms, Types & Causes

Parasites are microorganisms that live off of other organisms, or hosts, to survive. Some parasites don’t affect the host. Others grow, reproduce, or give off toxins that make the host sick resulting in a parasitic infection.


Parasitic infections are a large problem in tropical and subtropical regions. Malaria is one of the deadliest diseases caused by a parasite. There are also a number of parasitic infections that can occur in the U.S. Trichomoniasis, giardiasis, cryptosporidiosis, and toxoplamosis are the most common such infections that occur in the U.S.