The other main group of parasites that cause disease in humans is the Helminths or worms. The most important protozoa for the USMLE Step 1 medical board exam are Malaria, Babesiosis, Toxoplasmosis, Cryptosporidium, and Giardia Lamblia. Different species have a predilection for living in different parts of their human host. They move using a tail or foot like processes. These are microscopic unicellular eukaryotes that are motile. For the exam, the most important group of parasites is Protozoa. Parasites usually don’t kill their host, but can cause disease if the parasite burden is high enough. These organisms gain some sort of survival advantage (such as gaining nutrients) while their presence is often detrimental to the host. Parasites are organisms that live in or on a host.
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