etiologic and epidemiologic analysis of bacterial infectious upper respiratory disease in thoroughbred horses at the seoul race park.infectious upper respiratory disease (iurd) of thoroughbred racehorses has been a frequent problem (29.6% of incidence) at the seoul race park (korea). risk factors for iurd include the season with a high transfer rate (summer and fall), the stabling period (≤ 3 months), and age (2 to 3 years old), suggesting that the movement and new environment may have depressed the immune system of the horses and decreased their ability to respond properly to pathogens. the bacterial strains (n = 98) isolate ...201121586881
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