Tritrichomonas foetus
| Tritrichomonas foetus | |
|---|---|
| Kingdom | Protista |
| Phylum | Protozoa |
| Family | Trichomonadidae |
| Genus | Tritrichomonas |
| Species | T. foetus and more |
Also known as: Trichomonas foetus —— Trichomonas fetus
Introduction
Tritrichomonas foetus is a protozoal pathogen causing disease primarily in cattle and felids. It is identifiable by its pear-like shape, three anterior flagellae (recurrent flagellum) and an undulating membrane on one side.
Lifecycle and Transmission
Cattle
Tritrichomonas foetus is a venereal disease in cattle causing early embryonic death and abortion.
The protozoa resides on the surface and in the lumen of the female reproductive tract and in the crypt of penile epithelial cells. Transmission is achieved from infected individuals during mating and direct contact.
T. foetus has no known cyst stage, although carrier cows occur very rarely and the pathogenesis of th carrier state is unknown. Therefore, trophozoites replicate simply by binary fission. It is thought that T. foetus feeds from host lipids and fatty acids [1]
T. foetus is sometimes isolated from foetal gut and lung but this is unlikely to be due to invasion and more likely due to swallowing or inhalation of amniotic fluid in utero.
Cats
Tritrichomonas foetus is transmitted via the faecal: oral route in cats. Behaviours such as grooming may aid transmission by direct contact. The venereal route is unproven in cats.
Pathogenesis
Cattle
Proteinases secreted by T. foetus degrade substrates such as fibrinogen, albumin and immunoglobulins, thus altering the biological environment and resulting in embryonic death. Pyometra is occasionally observed in females but males show no clinical signs. For more information see Trichomonosis - Cattle
Cats
T. foetus mainly causes diarrhoea by colonisation of the large intestine. Recovery is slow but longterm prognosis is good. Reports of resistance and success are available for most anthelmintic and antibiotic therapies.
Other Tritrichomonas spp.
Others such as Trichomonas suis and Trichomonas vaginalis reside as commensals, usually in the gastrointestinal tract of other species such as pigs and guinea pigs respectively. Trichomonas gallinae occurs in birds.
Relevant Links: Trichomonosis - Cattle
References
- ↑ Beach DH, Holz GGJr, Singh BN, Lindmark DG, 1991. Phospholipid metabolism of cultured Trichomonas vaginalis and Tritrichomonas foetus. Molecular and Biochemical Parasitology, 44(1:97-108;19)
The Animal Health & Production Compendium, Tritrichomonas datasheet, accessed 02/06/2011 @ http://www.cabi.org/ahpc/
Feline Advisory Bureau, Tritrichomonas infection in cats, accessed 02/06/2011 @ http://www.fabcats.org/breeders/infosheets/tritrichomonas/
Wright, I.(2010) Tritrichomonas foetus: Jumping the Species Barrier, UK Vet, Vol 15, 1-3.
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