Korean Journal of Veterinary Research 2009;49(4):309-317.
Investigation on an epidemic of tuberculosis in dairy cattle farms In Jeongeup, Korea
Hachung Yoon1, Oun-Kyong Moon1, Youn-Ju Kim1, Bum-Joon Cho2, Soo-Doo Lee1, Jeong-Won Lee2, Sang-Jin Lee1
1Veterinary Epidemiology Division, National Veterinary Research and Quarantine Service
2Jeongeup Branch, Jeonbuk Institute of Livestock & Veterinary Research
전북 정읍지역 젖소농장 결핵병 집단 발생에 대한 역학조사
윤하정1, 문운경1, 김연주1, 조범준2, 이수두1, 이정원2, 이상진1
1국립수의과학검역원 역학조사과
2전라북도축산위생연구소 정읍지소
Abstract
The present study describes an investigation on an epidemic of Tuberculosis (TB) which has been occurred among dairy cattle farms in Jeongeup, Jeollabuk-do since 2007. The investigation was performed in three ways as follows: 1. Collecting information about bovine TB outbreaks using investigation reports, an on-the-spot and tracing-back investigations; 2. Analyzing the outbreak pattern; 3. Establishing hypothesis and performing statistical analysis on potential risk factors. In the early 2000s, TB outbreaks were sporadically reported in beef cattle, and only a small number ($1{sim}2$) of reactors was confirmed in each of outbreak farms. The number of TB outbreaks has been suddenly increased from 2007, mainly in dairy cattle farms. And these outbreaks were temporarily clustered during the period, from March 2007 to April 2009 (relative risk, RR = 13.7, p < 0.001). And two spatial clusters of which radiuses were 0.3 km (RR = 6.9, p < 0.001) and 0.9 km (RR = 3.6, p < 0.01). The analysis to find risk factors was performed on 99 dairy farms (21 outbreaks), which are located in the most seriously affected village during 2007-2009. Middleman (odds ratio, OR = 47.4, p < 0.05) and raw milk collecting system (OR = 6.9, p < 0.05) were recognized as with the highest association. Considering the fact that all the outbreak farms except one had their own manure composting tank, it might be that the manure containing pathogen was leaked from tank and transmitted to other farms by fomites such as middleman or raw milk collecting system.
Key Words: cattle, dairy, epidemic, investigation, tuberculosis


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