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Nature of the disease
Contagious Equine Metritis is a disease due to a coccibacillus, Taylorella equigenitallis causing metritis in mares.
OIE, List B disease
Susceptible species
Only present in Europe and Japan. In the Pacific Region only Australia reported the disease where it has not been recorded since 1980. 
Clinical signs 
Incubation period is 10-14 days, mares show:
  • Abundant mucopurulent vaginal discharge,
  • Shortened oestrous cycle,
  • Spontaneous recovery after 3-4 weeks, sometimes mares become chronic carriers for many months

No clinical sign in males

Post-mortem findings 
Not applicable.
Differential diagnosis 
  • Infection by Streptococcus zooepiemicus,
  • Dourine.
Specimens required for diagnosis 
In females: swab from the cervix or endometrium; combined swab from urethra, clitoral fossa and clitoral sinuses

In males: swab from the prepuce, anterior urethra and urethral fossa.

Swab should be kept in transport medium at ambient temperature, the organism is cultivated and then identified using biochemical testing, latex agglutination kit based on monoclonal antibodies is also used.

Sexual. Iatrogenic transmission by artificial insemination and veterinary material can also occur.
Risk of introduction   
Contagious Equine Metritis could be introduced by importation of infected animals, materials or semen.
Control / vaccines  
There is no vaccine, the control of the disease is made by systematic testing of stallions and mares before mating and diagnosis confirmation in case of suspicion.
  • GEERING WA, FORMAN AJ, NUNN MJ, Contagious Equine Metritis In Exotic Diseases of Animals, Aust Gov Publishing Service, Canberra, 1995, p. 316-320
  • Contagious Equine Metritis, In Veterinary Medicine, Saunders, Eight ed, 1997, London p. 1019-1020
  • Office International des Epizooties, 2002
  • Office Vétérinaire Fédéral Suisse