Which category of parasites typically resides on the exterior surface of the host?

Which category of parasites typically resides on the exterior surface of the host?

• A. Ectoparasites
• B. Endoparasites
• C. Protozoa
• D. Helminths

Answer: (A)

Parasites are categorized by where they live on the host. Those that stay on the outside—on the skin, fur, scales, or feathers—are ectoparasites. They attach to or feed from the exterior, unlike endoparasites that live inside the body (in the gut, tissues, or bloodstream). Protozoa and helminths describe broad groups of parasites, and within them you can have both internal and external species, but the term that specifically denotes living on the exterior is ectoparasites. Examples include fleas, lice, ticks, and mites.

Parasites are categorized by where they live on the host. Those that stay on the outside—on the skin, fur, scales, or feathers—are ectoparasites. They attach to or feed from the exterior, unlike endoparasites that live inside the body (in the gut, tissues, or bloodstream). Protozoa and helminths describe broad groups of parasites, and within them you can have both internal and external species, but the term that specifically denotes living on the exterior is ectoparasites. Examples include fleas, lice, ticks, and mites.