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

Alaria species are intestinal trematodes of domestic dogs and occasionally cats, and of free-ranging canids and felids.

Alaria species in people

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

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.

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.

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 species — cats

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

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.

Dicrocoelium dendriticum

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

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.

Dipylidium caninum

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

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 — pigs

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

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.

Ixodes species

Ixodes spp. ticks are a genus of hard ticks found worldwide. In North America, the primary species of veterinary and public health importance are I. scapularis (in southern Manitoba, Ontario, Quebec, New Brunswick, Nova Scotia and the eastern USA) and I. pacificus (in coastal regions of western North America).

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.

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.

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.

Nanophyetus salmincola

Adults of the trematode Nanophyetus salmincola live in the small intestine of domestic dogs and free-ranging fish-eating mammals in northwestern North America and eastern Russia.

Neospora caninum

Neospora caninum is a protozoan parasite, closely related and in several respects similar to Toxoplasma gondii, that is a major cause of abortion in cattle around the world and an occasional cause of neurological disease in young calves, dogs and other mammalian hosts.

Notoedres cati

Mites of the burrowing mite genus Notoedres infest domestic cats and free-ranging felids, and rarely domestic dogs and free-ranging canids, around the world.

Oestrus ovis

Oestrus ovis, the sheep nasal bot, can be found in sheep farming areas worldwide, including in Canada.

Onchocerca cervicalis

The nematode Onchocerca cervicalis occurs in horses in many regions of the world where suitable midge intermediate hosts (Culicoides species) are also present.

Oxyuris equi

The pinworm nematode Oxyuris equi occurs in horses around the world, including Canada.

Parascaris equorum

The ascarid nematode Parascaris equorum occurs in horses around the world, including Canada.

Physaloptera species

Physaloptera spp. are spiruroid stomach nematodes that occur primarily in cats, wild felids and occasionally dogs in North America, including Canada, as well as in South America, China, and Africa.

Sarcocystis neurona

Sarcocystis neurona is an intracellular, apicomplexan protozoan that occurs in horses and other hosts in the Americas.

Sarcocystis species

Species of the intracellular, apicomplexan protozoan Sarcocystis occur in mammals, reptiles and birds around the world, including in Canada.

Sarcocystis species-pigs

Species of the intracellular, apicomplexan protozoan Sarcocystis occur in mammals, reptiles and birds around the world, including in Canada.

Setaria species

Nematodes of the genus Setaria infect cattle, sheep, sometimes other domestic animal hosts, and many free-ranging ungulates around the world, including in Canada.

Setaria species — pigs

Nematodes of the genus Setaria infect cattle, sheep, sometimes other domestic animal hosts, and many free-ranging ungulates around the world, including in Canada.

Stomoxys calcitrans — stable fly

The stable fly Stomoxys calcitrans occurs around the world. The life cycle involves egg laying in faeces or decaying and damp organic material, for example straw bedding.

Strongyloides stercoralis

The nematode Strongyloides stercoralis is primarily a parasite of people, but also occurs in dogs and sometimes cats.

Strongyloides westeri

The nematode Strongyloides westeri occurs in horses around the world, including Canada.

Strongylus edentatus

The nematode Strongylus edentatus occurs in horses around the world, including Canada.

Strongylus equinus

The nematode Strongylus equinus occurs in horses around the world, including Canada.

Strongylus vulgaris

The nematode Strongylus vulgaris occurs in horses around the world, including Canada.

Taenia ovis and Cysticercus ovis

Cysticercus ovis, the infective larval stage of Taenia ovis, a cestode parasite of dogs (and perhaps free-ranging carnivores), occurs around the world, including in Canada.

Taenia solium and Cysticercus cellulosae

Taenia solium is a cyclophyllid cestode with adults found in the small intestine of people and the larval stages (Cysticercus cellulosae) found in muscle tissue of pigs.

Taenia species

The cestode genus Taenia includes several species that as adults live in the small intestine of dogs and/or cats and free-ranging carnivores around the world.

Thelazia species

The nematode Thelazia (eye worm) occurs in cattle and rarely sheep and goats around the world, including in Canada.

Tick-borne pathogens

Relative to the United States and many other countries, the burden of tick-borne pathogens that can infect pets and people is thought to be relatively low in Canada.

Toxascaris leonina

Toxascaris leonina is an ascarid nematode of the small intestine of domestic dogs and cats and free-ranging canids and felids.

Toxocara cati

Toxacara cati is an ascarid nematodes of the small intestine of cats and free-ranging felids. It occurs around the world, including Canada.

Toxocara vitulorum

The small-intestinal nematode Toxocara vitulorum infects cattle, buffalo, zebu and rarely sheep and goats, mostly in tropical and subtropical climates like those in Africa, India and Asia.

Toxoplasma gondii

Toxoplasma gondii is a zoonotic intracellular apicomplexan protozoan parasite of mammals and birds that occurs around the world, including in Canada.

Toxoplasma gondii

Toxoplasma gondii is a zoonotic intracellular apicomplexan protozoan parasite of mammals and birds that occurs around the world, including in Canada.

Toxoplasma gondii — pigs

Toxoplasma gondii is a zoonotic intracellular apicomplexan protozoan parasite of mammals and birds that occurs around the world, including in Canada.

Trichinella species

Historically in Canada, infection of pigs with the zoonotic nematode Trichinella, specifically T. spiralis, was a significant public health concern, but currently the national pig herd is considered free of the parasite except for a possible small focus around Halifax, Nova Scotia.