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contagious equine metritis : ウィキペディア英語版 | contagious equine metritis Contagious Equine Metritis (CEM) is a venereal infection of the genital tract of horses brought on by the ''Taylorella equigenitalis'' bacteria. Passed on through sexual contact, according to Robert N. Oglesby DVM, the disease was first reported in 1977 on horse breeding farms in England and was found in 1978 by Dr. C.E.D. Taylor in horses imported from Europe into the state of Kentucky in the United States. A second American outbreak occurred a year later in Missouri but in both cases, the diseases were quickly eradicated. (). The American Association of Equine Practitioners has advised that the disease has also been found in a few but limited cases in California, Virginia and New Jersey. On December 17, 2008 a case was reported by USDA-Aphis to the OIE in a 16-year-old Quarter Horse stallion standing at stud in Kentucky who had previously been located in Texas (). Contagious Equine Metritis has also been found in Japan, Germany, France, Netherlands, Scandinavia Bosnia and Morocco. == Signs ==
Signs in mares appear ten to fourteen days after breeding to an infected or carrier stallion. A gray to creamy vulvar discharge mats the hair of the buttocks and tail, although in many cases, the discharge is absent and the infection is not apparent. Most mares recover spontaneously, although many become carriers. Infected mares are usually infertile during the acute illness. However, the infertility only lasts a few weeks, after which pregnancy is possible. Stallions do not show signs of infection. The first indication of the carrier state is the appearance of Contagious Equine Metritis and/or lack of pregnancy in the mares covered by the stallion.
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