Symbiont that both lives inside of and damages its host.

Endoparasites as defined more broadly include helminths, various pathogenic fungi (i.e., particularly causing subcutaneous and systemic mycoses), and pathogens generally.

More strictly defined can include most helminths, however, though also burrowing (together, .

Contrast ectoparasite and see generally parasite, parasitism, and parasitology.