Solomon Ethan B, Potenski Catherine J, Matthews Karl R
Department of Food Science, Cook College, Rutgers, The State University of New Jersey, New Brunswick 08901-8520, USA.
J Food Prot. 2002 Apr;65(4):673-6. doi: 10.4315/0362-028x-65.4.673.
In this study, the transmission of Escherichia coli O157:H7 to lettuce plants through spray and surface irrigation was demonstrated. For all treatments combined, the number of plants testing positive following a single exposure to E. coli O157: H7 through spray irrigation (29 of 32 plants) was larger than the number testing positive following surface irrigation (6 of 32 plants). E. coli O157:H7 persisted on 9 of 11 plants for 20 days following spray irrigation with contaminated water. Immersion of harvested lettuce heads for 1 min in a 200 ppm chlorine solution did not eliminate all E. coli O157:H7 cells. The results of this study suggest that regardless of the irrigation method used, crops can become contaminated; therefore, the irrigation of food crops with water of unknown microbial quality should be avoided.
在本研究中，证明了大肠杆菌O157:H7通过喷雾灌溉和地面灌溉传播到生菜植株上。对于所有组合处理，通过喷雾灌溉单次接触大肠杆菌O157:H7后检测呈阳性的植株数量（32株中的29株）大于通过地面灌溉后检测呈阳性的植株数量（32株中的6株）。用受污染水进行喷雾灌溉后，11株中有9株的大肠杆菌O157:H7持续存在了20天。将收获的生菜头在200 ppm氯溶液中浸泡1分钟并不能消除所有大肠杆菌O157:H7细胞。本研究结果表明，无论使用何种灌溉方法，作物都可能被污染；因此，应避免用微生物质量未知的水灌溉食用作物。
