Contagious Equine Metritis Case Study

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Contagious Equine Metritis (CEM) was first discovered in 1977, subsequent to outbreaks in Newmarket, United Kingdom and Ireland affecting Thoroughbred populations (Timoney, 2011). Following these outbreaks of CEM, a ban on the importation of horses into the United States from the UK, Ireland and France was put into effect (Schulman et al., 2013). Despite implementation of strict requirements concerning the import of breeding horses from countries known or suspected to be affected by CEM, the first United States outbreak was reported within a year of the discovery of the disease (Timoney, 2011). According to Timoney (2011), the U.S. outbreak in 1978 affected Thoroughbred horses in Kentucky and the source of the outbreak was determined to be two stallions imported from France. The 1978 outbreak of CEM in Kentucky resulted in a total economic loss of 13.55 million, with about 1 million dollars lost for every day mares were not successfully bred and movement restrictions were in place (Timoney, 2011). Not long after its discovery, CEM became one of the most internationally recognized diseases in the equine industry (Timoney, 2011). Contagious Equine Metritis has been reported in 29 countries, including Japan, Australia, and countries in Europe, North America and South America (Timoney, 2011). Additionally, Schulman et al. (2013) state that there have been 146 confirmed cases of CEM in 12 countries between the years 2000 and 2012, most of which were related to non-Thoroughbred horses and artificial breeding populations. Recent outbreaks of CEM have occurred in the U.S. in 2008-09, South Africa in 2011, and the UK in 2012 (Schulman et al., 2013). Incidences of the disease are reported mainly in Europe, but the exact distribution is ha... ... middle of paper ... ...h apparently did not prevent transmission of T. equigenitalis (Erdman et al., 2011). With the exception of one, all other stallions were infected with T. equigenitalis indirectly via handling or contaminated fomites at breeding or collection facilities (Erdman et al., 2011). According to Erdman et al. (2011), this outbreak saw the largest number of horses that tested positive for the disease since the first outbreak in 1978. The source of the outbreak was most likely determined to be a stallion imported from Denmark in 2000 that had not been detected positive for T. equigenitalis neither upon pre-import testing in the country of origin nor quarantine testing in the United States (Erdman et al., 2011). The importation of this stallion in the United States subsequently led to subsequent transmission of infection between the years 2004 and 2009 (Erdman et al., 2011).

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