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Contagious equine metritis: effect of intrauterine inoculation of contagious equine metritis agent in pony mares



Contagious equine metritis: effect of intrauterine inoculation of contagious equine metritis agent in pony mares



American Journal of Veterinary Research 41(1): 5-9



Actively growing culture of contagious equine metritis (CEM) bacteria or infective exudate (or both) were inoculated intrauterine in pony mares. A direct relationship was observed between appearance and duration of cervicitis and vaginitis and vaginal exudate. Clinical signs appeared 1-3 days after mares were inoculated and lasted 7-23 days. In the acute phase of infection, all uterine and cervical samples yielded CEM bacteria. In the asymptomatic stage of infection, CEM bacteria were not isolated from uterine and cervical samples; in 33, 28 and 20% of the pony mares, CEM bacteria were present in the clitoral fossa, clitoral sinus and urethral vestibule, respectively. Sampling during early estrus increased the bacterial isolation rate to 57% in mares that were previously negative; 3 days later, CEM bacteria could not be isolated from 62% of the positive mares. Local antibodies may be present as no CEM bacteria could be recovered at 2, 7 and 15 days after re-exposure with a small number of bacterial cells (8.4 .times. 105 cells). CEM bacteria were isolated from all mares re-exposed with a large number of bacterial cells (7.2 .times. 108) at 2 days after 2nd inoculation and from 50% at 7 days. All mares were negative by day 15 after re-exposure, indicating increased resistance to CEM bacteria.

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Accession: 000621139

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PMID: 7189101


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