Aelurostrongylus abstrusus

Aelurostrongylus abstrusus occurs in cats in many parts of the world, especially where it is warm and damp. The parasite is seen occasionally as a clinical problem in British Columbia.

Alaria species in people

Rarely, human infections with Alaria have been reported, presumably following ingestion of raw or inadequately cooked frogs.

Anaplasma marginale

Anaplasma marginale is a rickettsial organism that infects the erythrocytes of cattle and is transmitted by ticks.

Ancylostoma caninum

Ancylostoma caninum is a pathogenic hookworm of domestic dogs and free-ranging canids, so called because its buccal capsule is bent dorsally in the form of a "hook."

Ancylostoma tubaeforme

The nematode Ancylostoma tubaeforme is a hookworm of cats that occurs around the world. Infection with A. tubaeforme is rarely diagnosed in cats in Canada.

Angiostrongylus vasorum

Angiostrongylus vasorum occur in dogs, foxes, coyotes and lynx. So far in Canada, the parasite is only found in the Avalon Peninsula of Newfoundland. It's also found in South America, Europe and Africa.

Ascaris suum

Ascaris suum is a large ascarid nematode found in the small intestine of pigs.

Baylisascaris procyonis

Baylisascaris procyonis is a small-intestinal nematode of raccoons in North and Central America, including Canada

Baylisascaris procyonis in people

Baylisascaris procyonis is a small-intestinal nematode of raccoons in North and Central America, including Canada, and is also present in raccoons introduced into Europe and Japan.

Besnoitia species

The apicomplexan protozoan Besnoitia infects cattle and goats in tropical and subtropical countries, especially in Africa.

Capillaria plica

The nematode Capillaria plica occurs in the urinary bladder of dogs, free-ranging carnivores, and rarely cats, worldwide, likely including Canada.

Cheyletiella species

Dogs and cats each have their own species of the mite Cheyletiella, which appear to be host-specific — C. yasguri in dogs and C. blakei in cats.

Chorioptes equi

The surface mite Chorioptes occurs on horses and other equids around the world.

Cryptosporidium species

Cryptosporidium spp. are gastrointestinal coccidians (although the taxonomy is controversial) of a wide range of vertebrates (mammals, birds, amphibians, reptiles, and fish). Surveys from several locations around the world based on fecal examination for Cryptosporidium oocysts have demonstrated a prevalence of up to 40 per cent in dogs and cats.

Cryptosporidium species in people

Among the currently recognized species of Cryptosporidium, C. hominis and C. parvum are the most common isolates from people, although human infections with several other species have been reported: C. canis, C. felis, C. meleagridis (birds) and C. ubiquitum (many hosts); and, less commonly, C. andersoni (cattle), C. cuniculus, C. muris and C. suis.

Cryptosporidium species — pigs

Pigs have their own species of Cryptosporidium - C. suis (which has been recovered very rarely from people), as well as natural infections with the potentially zoonotic C. parvum.

Cryptosporidium species — sheep

The primary species in sheep (and goats) is potentially zoonotic C. parvum. A new species - C. xiaoi - has recently been described from sheep, but its occurrence and significance have not yet been fully determined.

Ctenocephalides on people

Fleas are not very host specific, and animal and bird fleas will readily feed on people, even if they do not usually proceed to egg laying. Dogs or cats that have large burdens of fleas are particularly likely to pass them on to people.

Cuterebra species — rabbit bot

Adults of the dipteran (fly) genus Cuterebra are free-living. Larvae are found under the skin of various hosts, generally rodents but occasionally dogs and cats.

Cyathostomins

The cyathostomins are a large group of genera and species of closely related nematodes that live as adults in the large intestine of horses around the world, including Canada.

Cystoisospora species

Dogs and cats around the world, especially pups and kittens, are often infected with a range of species of Cystoisospora (formerly known as Isospora).

Demodex canis

Demodex mites are common in the hair follicles and sometimes sebaceous glands of the skin of dogs around the world.

Demodex species — cats

Cats can be infested with three species of Demodex: D. cati, D. gatoi, and a third, as yet un-named species.

Dermacentor albipictus

Dermacentor albipictus (the winter tick or moose tick) is a large reddish-brown to gray-brown tick. In Canada, D. albipictus is found in all provinces and territories, appearing as far north as the southern Yukon.

Dermacentor andersoni -- horses

Dermacentor andersoni is a large reddish-brown to gray-brown tick. In Canada, it is found from central Saskatchewan and west through Alberta and into British Columbia.

Dermacentor variabilis: American dog tick

Dermacentor variabalis is a large reddish-brown to gray-brown tick. In Canada, D. variabilis is found from eastern Saskatchewan and east through to Nova Scotia, primarily in the southern portions of each province.

Dermacentor variabilis — horses

Dermacentor variabalis is a large reddish-brown to gray-brown tick. In Canada, D. variabilis is found from eastern Saskatchewan and east through to Nova Scotia, primarily in the southern portions of each province.

Dicrocoelium dendriticum

The trematode Dicrocoelium dendriticum occurs in cattle, sheep and other ungulates in many parts of the world, including western Canada.

Dictyocaulus arnfieldi

The lung nematode Dictyocaulus arnfieldi occurs in horses and other equids in many parts of the world, including rarely in Canada.

Dictyocaulus filaria

Dictyocaulus filaria occurs in sheep in many areas of the world, including Canada, where it seems to be a rare cause of clinical disease.

Dictyocaulus viviparus

The lung nematode Dictyocaulus viviparus occurs in cattle in many parts of the world, including Canada. Adult parasites live in the trachea and bronchi.

Dioctophyma renale

Dioctophyma renale occurs in dogs, foxes, mink, ferrets, otters, cats (on occasion), pigs, horses, cattle and people.

Diphyllobothrium species

Adult cestodes of the genus Diphyllobothrium live in the small intestine of dogs and other fish-eating mammals and birds in many parts of the world, especially the northern hemisphere.

Dipylidium caninum

Dipylidium caninum is a tapeworm of the small intestines of domestic dogs and cats and free-ranging canids and felids.

Dirofilaria immitis

The nematode Dirofilaria immitis (heartworm) occurs in domestic dogs and less often in cats, and in free-ranging canids and other carnivores, in many regions of the world.

Dracunculus insignis

Diagnosed infections of Dracunculus insignis in dogs living in Canada seems to be very rare.

Echinococcus canadensis

The cestode genus Echinococcus contains at least seven established species, two of which (Echinococcus canadensis and E. multilocularis) occur in Canada.

Echinococcus multilocularis

The cestode genus Echinococcus contains at least seven established species, two of which occur in Canada: Echinococcus canadensis and E. multilocularis.

Eimeria leuckarti

Eimeria leuckarti is a coccidian protozoan that infects horses around the world, including in Canada.

Eimeria species

Coccidian protozoa of the genus Eimeria are common in cattle around the world. Many species are considered to be of little or no clinical significance but in Canada E. zuernii and E. bovis are associated with disease.

Eucoleus (Capillaria) aerophila

Eucoleus aerophila is a tracheal worm that infects primarily foxes and occasionally other free-ranging carnivores, dogs, cats and people.

Eutrombicula species

Trombiculid mites are free-living but their larval stages can infest a range of mammals, birds and people, causing sometimes severe skin lesions characterised by intense pruritus.

Eutrombicula species on people

Trombiculid mites (harvest mites or chiggers) are free-living mites that occur in many parts of the world, including Canada.

Fasciola hepatica

The trematode Fasciola hepatica (the common liver fluke of ruminants) infects cattle and sheep, and less commonly a range of domestic and wildlife species, around the world.

Fascioloides magna

The trematode Fascioloides magna (the large liver fluke of ungulates) occurs in several areas of the world, including parts of Canada.

Free-living amoebae

Free-living amoebae are protozoa that normally live in the environment and only occasionally infect human or animal hosts. Acanthamoeba spp. and Naegleria fowleri are the most commonly seen species, both causing central nervous system infection and disease.

Gasterophilus

Bot flies of the genus Gasterophilus infest horses around the world, including Canada.

Giardia species

Giardia species occur around the world in people, domestic animal and wildlife.

Giardia species-horses

Little is known of the occurrence or clinical significance of Giardia species in horses.

Giardia species in people

Among the species and assemblages (similar to genotypes) of Giardia infecting mammals, birds (G. ardeae and G. psittaci), amphibians (G. agilis) or reptiles (G. varani), almost all human infections are associated with G. duodenalis Assemblage A or Assemblage B (newly named G. enteritica), both of which also infect a wide range of domestic animals and wildlife.

Giardia species — pigs

Very little is known of the occurrence and production and clinical significance of Giardia in pigs.

Haematobia irritans

The hornfly Haematobia irritans occurs in association with cattle around the world, including in Canada.

Hypoderma bovis and H. lineatum

Hypoderma bovis and Hypoderma lineatum are the common warble flies of cattle, and occasionally other hosts, in the northern hemisphere.

Isospora suis

Pigs around the world, especially piglets, are often infected with a range of coccidian species of which Isospora suis appears to be the most significant.

Lice: chewing and sucking species

Sucking and chewing lice occur on cattle around the world. The life cycle is direct and all life cycle stages - adults, eggs (nits), larvae and nymphs occur on the host.

Lice of animal origin on people

Lice are generally host-specific, and while the species from domestic and free-ranging animals and birds might stray on to animals other than their normal hosts, or on to people, they usually do not cause any problems or establish on these accidental hosts.

Melophagus ovinus

The ked Melophagus ovinus is a Dipteran (two-winged fly) without wings, and occurs on sheep around the world, including in Canada.

Metastrongylus species

Metastrongylus spp. are lung nematodes found in pigs. This parasite is present in many parts of the world and is only found rarely in Canada. Adult parasites live in the bronchi and bronchioles.

Metorchis conjunctus in people

In the past M. conjunctus was an occasional parasite of inhabitants of northern Canada, but now seems to be less common, perhaps because fewer sucker fish are consumed.

Mites (miscellaneous) of animal origin on people

As well as Cheyletiella, and Sarcoptes, and Notoedres , there are many other mite parasites of animals and birds that will also infest people, sometimes causing significant clinical problems but not establishing on the accidental human hosts.

Moniezia and Thysanosoma

The large cestodes Moniezia and Thysanosoma in cattle and sheep, and occasionally free-ranging ungulates, are found around the world, including in Canada.

Musca autumnalis

The face fly Musca autumnalis occurs on cattle and sometimes horses around the world, including in Canada.

Myiasis

Myiasis is the infestation of living vertebrates with the larvae of flies, the species of which vary with location around the world.

Myiasis - pigs

Myiasis is the infestation of living vertebrates with the larvae of flies, the species of which vary with location around the world.