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Contagious equine metritis (CEM) isolated in the UK:

After an absence from the UK of six years, the bacteria that causes contagious equine metritis (CEM) has been isolated from a pregnant thoroughbred mare in Scotland, reports the Equine Disease Quarterly (Kentucky, US). After the organism was identified, the stallion which covered the mare, and other horses from the same stud farm in Shropshire, UK, were examined for the presence of CEM. Two stallions and several mares covered by the stallions in 1995 and 1996 were found to be positive. In April, a maiden mare covered by a stallion on a farm in Leicestershire proved to be positive. The source of infection is thought to be the stallion, which had previously covered a mare from the Shropshire stud farm. The bacteria, a streptomycin-resistant strain of Taylorella equigenitalis, has proved difficult to culture. Investigations are being carried out to determine whether the strain differs from previously isolated strains.


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