Contagious Equine Metritis - CEM

This Code of Practice covers disease caused by three species of bacteria:

  • Taylorella equigenitalis (the contagious equine metritis organism - CEMO)
    Contagious equine metritis (CEM), caused by this organism, occurs widely in the non-Thoroughbred population, and to a limited extent in Thoroughbreds, in mainland Europe. 
  • Klebsiella pneumoniae (K. pneumoniae)
    There are many capsule types of K. pneumoniae, most of which do not cause venereal disease. However, types 1, 2 and 5 may be sexually transmitted. Therefore, when K. pneumoniae is identified from breeding stock, tests to determine the capsule type(s) present must be undertaken.
  • Pseudomonas aeruginosa (P. aeruginosa)
    Not all strains of P. aeruginosa cause venereal disease but there is no reliable method to differentiate between the strains. Therefore, all isolates should be considered as potential venereal pathogens.

Both K. pneumoniae and P. aeruginosa occur sporadically within Europe.