- Class: Nematoda .
- Superfamily: Trichuroidea .
- Genus: Capillaria .
- Rarely recorded in domestic pets.
- Occurs primarily in cats in contact with foxes, eg rural cats, but occasionally urban cats.
- Prevalence of infection in foxes in Europe and USA can reach 20-75%.
- Prevalence in foxes in southern England recently recorded as 0.2%.
- Prevalence nationwide in USA is 0.4% (west 0.07%; southeast 0.72%.).