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Uncinaria stenocephala hookworm eggs found in cat feces
The common flea tapeworm of cats, Dipylidium caninum
Post-mortem specimen from a cat which died suddenly from D. immitis infection[1]
Adult Gnathostoma spinigerum nematode
Giardia spp parasite, a common cause of diarrhoea in cats
Tritrichomonas foetus isolates from a cat

The term parasitism may be defined as a two-species association in which one species, the parasite, lives on or in a second species, the host, for a significant period of its life and obtains nourishment from it. However, there are members of the scientific community who designate all infectious agents of animals as parasites including viruses, protozoa, bacteria and fungi as well as the arthropods, helminths and protozoa. In this forum, we maintain the edict that parasites are those which rely on cats as an essential aspect of their life cycle.

See also - alphabetical listing of parasites

Parasites of the cat, based on organ affected


- Mosquitoes
- Flies - Oestrus ovis, Cuterebra spp, Cochliomyia spp, Chrysomyia spp, Triatoma spp , Cordylobia anthropophaga, Wohlfahrtia vigil, Dermatobia hominis
- Fleas - Ctenocephalides felis, Ctenocephalides canis, Echidnophaga gallinacea, Pulex irritans, Xenopsylla astia, Synosternus pallidus
Ticks - Ixodes holocyclus, Rhipicephalus sanguineus, Ornithodoros talaje, Otobius megnini, Dermacentor spp, Amblyomma spp
Mites - Demodex spp, Eutrombicula alfreddugesi, Neotrombicula autumnalis, Notoedres spp, Otodectes spp, Cheyletiella spp, Lynxacarus radovskyi, Sarcoptes spp, Helenicula miyagawai[3], Hexidionis garfieldi[4], Dermanyssus spp, Tyrophagus spp
Lice - Felicola subrostratus, Heterodoxus spiniger
Nematodes - Rhabditis strongyloides, Strongyloides spp, Ancylostoma spp, Anatrichosoma spp, Lagochilascaris spp


Syngamus (Mammomonogamus) auris


Thelazia spp


Nematodes - Dirofilaria immitis, Brugia malayi, Brugia pahangi, Dipetalonema reconditum
Haemoplasmas - Cytauxzoon felis, Babesia spp, Mycoplasma spp, Leishmania spp, Trypanosoma spp
Hepatozoon spp, Rickettsia spp, Bartonella spp, Ehrlichia spp, Anaplasma spp, Theileria spp
Trematodes - Schistosoma spp, Heterobilharzia spp, Ornithobilharzia spp


Toxocara cati, Dirofilaria spp, Toxoplasma spp
Cuterebra spp


Gurltia paralysans


Capillaria aerophilia, Eucoleus aerophilus, Oslerus rostratus, Bronchostrongylus sucrenatus
Aelurostrongylus abstrusus, Paragonimus spp, Troglostrongylus subcrenatus, Strongyloides stercoralis, Crenosoma spp. Vogeloides spp


Parametorchius complexus, Platynosomum spp, Opisthorchis felineus, Clonorchis sinensis
Eurytrema procyonis, Eurytrema pancreaticum, Mammomonogamus spp, Euparadistomum spp
Amphimerus spp, Opisthorchis spp, Paropisthorchis spp, Metorchis spp

Urinary bladder

Pearsonema plica, Rhabditis strongyloides, Capillaria plica
Pearsonema feliscati, Capillaria feliscati

Interstitium (Tissue)

Nematodes - Dipetalonema reconditum, Bronchostrongylus sucrenatus, Cuterebra spp, Trichinella spiralis
Dirofilaria repens, Mammomonogamus spp, Physaloptera spp
Trematodes - Parametorchius complexus, Platynosomum spp, Eurytrema procyonis
Protozoa - Hepatozoon spp, Neospora spp, Cytauxzoon felis


Trichinella spiralis


Protozoa - Tetratrichomonas felistomae
Nematodes - Lagochilascaris spp
Trematodes - Clinostomum spp


Ollulanus tricuspis, Physaloptera spp, Spirocerca lupi, Aonchotheca putorii, Cyathospirura spp, Cylicospirura felineus[5], Abbreviata gemina, Gnathostoma spp, Turgida turgida

Small intestine

Protozoa - Giardia spp, Cryptosporidium spp, Isospora spp, Eimeria spp, Hammondia pardalis
Toxoplasma gondii, Hammondia hammondi, Sarcocystis spp
Balantidium coli, Tritrichomonas spp, Cystoisospora spp, Microsporidium spp
Nematodes - Ancylostoma braziliense, Ancylostoma tubaeforme, Strongyloides spp
Besnoitia spp, Hammondia hammondi, Mesocestoides spp, Toxascaris leonina, Cylicospirura spp
Toxocara spp, Trichuris spp, Pterygodermatites spp, Uncinaria stenocephala, Physaloptera spp
Trematodes - Metagonimus spp, Eurytrema procyonis, Mammomonogamus spp, Heterophyes spp, Echinostoma spp
Parametorchius complexus, Platynosomum fastosum. Pharyngostomum cordatum, Gymnophalloides seoi
Heterophyopsis continua, Centrocestus armatus, Stellantchasmus falcatus, Acanthotrema felis, Plagiorchis spp
Stictodora lari, Stictodora fuscata, Procerovum spp, Cryptocotyle spp, Stephanoprora spp
Diplostomulum spp, Neodiplostomum spp, Alaria marcianae, Brachylaemus erinacei, Cynodiplostomum spp
Fibricola spp, Episthmium spp, Artyfechinostomum spp, Isthmiophora spp, Echinoparyphium spp
Apophallus spp, Ascocotyle spp, Euryhelmis spp, Galactosomum spp, Haplorchis spp, Dexiogonimus spp
Microphalloides vajrasthirae, Nanophyetus spp, Pygidiopsis summa
Cestodes - Spirometra spp, Mesocestoides spp, Dipylidium spp, Diphyllobothrium spp, Echinococcus multilocularis
Echinococcus granulosus, Mesostephanus spp, Prohemistomum vivax, Taenia taeniaeformis, Spirometra spp
Joyeuxiella spp, Choanotaenia spp, Diphyllobothrium spp, Diplopylidium spp
Acanthocephalans - Bolbosoma spp, Centrorhynchus aluconis, Oncicola spp. Moniliformis spp

Large intestine

Pentatrichomonas hominis
Strongyloides spp

See also


  1. Atkins, CE & Litster, AL (2006) Heartworm disease. In August, JR (Ed): Consultations in feline internal medicine. Vol 5. Elsevier Saunders, Philadelphia. pp:323-330
  2. Dr Eric Barchas, 2009 Vet Blog
  3. Takahashi M et al (2004) Trombidiosis in cats caused by the bite of the larval trombiculid mite Helenicula miyagawai (Acari: Trombiculidae). Vet Rec 154(15):471-472
  4. Goff ML & McKown RD (1997) The genus Hexidionis (Acari:Trombiculidae) with the description of a new species from Texas. J Med Entomol 34(4):438-440
  5. Coman BJ et al (1981) Helminth parasites and arthropods of feral cats. Aust Vet J 57(7):324-327