- Platyhelminths (flatworms)
- Trematodes (flukes): non-segmented
- Lung: Paragonimus species
- Liver
- Fasciola hepatica (common liver fluke or sheep liver fluke)
- Opisthorchis viverrini (Southeast Asian liver fluke)
- Clonorchis sinensis (Chinese liver fluke)
- Metorchis conjunctus (Canadian liver fluke)
- Dicrocoelium dendriticum (lancet liver fluke)
- Intestinal
- Blood: Schistosoma species
- Cestodes (tapeworms): segmented
- Pseudophyllideans
- Cyclophyllideans
- Intestinal
- Taenia solium (pork tapeworm)
- Taenia saginata (beef tapeworm)
- Hymenolepis nana (dwarf tapeworm)
- Hymenolepis diminuta
- Dipylidium caninum
- Tissue
- Echinococcus granulosus (hydatid worm)
- Echinococcus multilocularis (alveolar hydatid disease)
- Larvareal Taenia solium (cysticercosis)
- Taenia multiceps and Taenia serialis (multiceps serialis))
- Intestinal
- Trematodes (flukes): non-segmented
- Nematodes (roundworms)
- Filarial roundworms
- Onchocerca volvulus (river blindness)
- Loa loa (eye worm)
- Wuchereria bancrofti (lymphatic filariasis)
- Brugia malayi and Brugia timori (lymphatic filariasis)
- Mansonella perstans, Mansonella streptocerca, and Mansonella ozzardi
- Non-filarial roundworms
- Intestinal
- Ascaris lumbricoides (great roundworm)
- Necator americanus (New World hookworm)
- Ancylostoma duodenale (Old World hookworm)
- Strongyloides stercoralis (threadworm)
- Trichuris trichuria (whipworm)
- Enterobius vermicularis (pinworm)
- Capillaria species
- Trichostrongylus species
- Anisakis species
- Tissue
- Trichinella spiralis (pork worm)
- Ancylostoma braziliense, Ancylostoma caninum, and other spp. (cutaneous larva migrans, creeping eruption)
- Dracunculus medinensis (Guinea worm)
- Toxocara canis and Toxocara cani (visceral larva migrans)
- Angiostrongylus cantonensis (rat lungworm)
- Gnathostoma species
- Baylisascaris procyonis (raccoon roundworm)
- Dioctophyme renale (giant kidney worm))
- Intestinal
- Filarial roundworms
Investigations
- Eosinophilia seen in tissue-invasive worms, not in those that live in the gut or in cystic structures