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Parlevliet, J.M. (Utrecht University, Utrecht, The Netherlands.); Bleumink-Pluym, N.M.C; Houwers, D.J; Remmen, J.L.A.M; Sluijter, F.J.H; Colenbrander, B
Theriogenology, (15 Apr 1997), 1997-Apr-15, 19970415, Letnik: 47, Številka: 6Journal Article
Contagious equine metritis (CEM) is a sexually transmissible disease in mares. Although the disease is commonly diagnosed by culturing the causative bacterium Taylorella equigenitalis (T. equigenitalis), false negative results do occur. A recently developed Polymerase Chain Reaction (PCR) assay, however, appeared to be much more sensitive, with initial results indicating an unexpected high incidence of the agent in selected horses. In this study, samples from 107 randomly selected mares with no clinical signs of CEM submitted for conventional culture were all negative for T. equigenitalis, but in the PCR-assay 54 (49%) were positive for Taylorella-DNA. Positives in the PCR-assay were found in all breeds tested, even in horses imported from the isolated population in Iceland. These findings suggest that T. equigenitalis was present long before it was first isolated in 1977. The high incidence of Taylorella in horse populations without apparent clinical signs of CEM, the occurrence of incidental clinical case and the known variability between strains, all indicate that Taylorella is endemic in the horse population. In order to explore whether the organism is present in species other than the horse, we also used the PCR-assay on clinically healthy donkeys (n=14), zebras (n=15), Przewalski horses (n=2) and cows (n=21). All the animals showed negative results except one of the Przewalski horses, and one cow that was repeatedly found to give positive reaction. We also found that the fertility of 7 stallions with cultures positive for Taylorella (6 used in an AI-program and 1 by natural breeding) was not affected, as shown by the normal range of foaling rates in mares inseminated or bred by these stallions. The overall results may be interpreted to mean that Taylorella is of limited significance in horse breeding
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