Baby Chamaeleons, Taronga Zoo, Sydney, New South Wales, Australia

Chameleons are parasitized by nematode worms, including threadworms (Filarioidea). Threadworms can be transmitted by biting insects such as ticks and mosquitoes. Other roundworms are transmitted through food contaminated with roundworm eggs; the larvae burrow through the wall of the intestine into the bloodstream.
Chameleons are subject to several protozoan parasites, such as Plasmodium which causes malaria, Trypanosoma which causes sleeping sickness, and Leishmania which causes leishmaniasis.
Chameleons are subject to parasitism by coccidia, including species of the genera Choleoeimeria, Eimeria, and Isospora.