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首页> 外文期刊>Applied Microbiology >Effect of Proximity to a Cattle Feedlot on Escherichia coli O157:H7 Contamination of Leafy Greens and Evaluation of the Potential for Airborne Transmission
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Effect of Proximity to a Cattle Feedlot on Escherichia coli O157:H7 Contamination of Leafy Greens and Evaluation of the Potential for Airborne Transmission

机译：牛饲养场附近对绿叶蔬菜大肠杆菌O157：H7污染的影响及机载传播潜力的评估

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The impact of proximity to a beef cattle feedlot on Escherichia coli O157:H7 contamination of leafy greens was examined. In each of 2 years, leafy greens were planted in nine plots located 60, 120, and 180 m from a cattle feedlot (3 plots at each distance). Leafy greens (270) and feedlot manure samples (100) were collected six different times from June to September in each year. Both E. coli O157:H7 and total E. coli bacteria were recovered from leafy greens at all plot distances. E. coli O157:H7 was recovered from 3.5% of leafy green samples per plot at 60 m, which was higher ( P < 0.05) than the 1.8% of positive samples per plot at 180 m, indicating a decrease in contamination as distance from the feedlot was increased. Although E. coli O157:H7 was not recovered from air samples at any distance, total E. coli was recovered from air samples at the feedlot edge and all plot distances, indicating that airborne transport of the pathogen can occur. Results suggest that risk for airborne transport of E. coli O157:H7 from cattle production is increased when cattle pen surfaces are very dry and when this situation is combined with cattle management or cattle behaviors that generate airborne dust. Current leafy green field distance guidelines of 120 m (400 feet) may not be adequate to limit the transmission of E. coli O157:H7 to produce crops planted near concentrated animal feeding operations. Additional research is needed to determine safe set-back distances between cattle feedlots and crop production that will reduce fresh produce contamination.
机译：检查了靠近肉牛饲养场对大肠杆菌O157：H7污染多叶蔬菜的影响。在两年的每一年中，在距牲畜饲养场60、120和180 m的9个地块（每个距离3个地块）上种植绿叶蔬菜。每年的六月至九月，共分六次采集了绿叶蔬菜（270）和育肥场粪便样品（100）。大肠杆菌O157：H7和总的大肠杆菌细菌均在所有小区距离均从绿叶蔬菜中回收。在60 m处从每块地的3.5％绿叶绿色样品中回收了O157：H7大肠杆菌，比180 m处每块地的阳性样品的1.8％高（P <0.05），表明随着距离饲养场增加。尽管未在任何距离的空气样本中回收到大肠杆菌O157：H7，但在饲养区边缘和所有小区距离处的空气样本中均回收到了大肠杆菌，这表明可以通过空气传播病原体。结果表明，当牛围栏表面非常干燥并且这种情况与牛的管理或产生空气尘埃的牛的行为相结合时，从牛生产中空运大肠杆菌O157：H7的风险就会增加。当前120 m（400英尺）的绿叶绿地距离准则可能不足以限制大肠杆菌O157：H7的传播，从而无法在集中动物饲养附近种植农作物。需要进行其他研究来确定牛饲养场和农作物产量之间的安全距离，以减少新鲜农产品的污染。

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