A glimpse of Escherichia coli O157:H7 survival in soils from eastern China

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• 作者：Haizhen Wang^a ; ^b ; ^c ; A. Mark Ibekwe^b ; Jincai Ma^b ; ^c ; ¹ ; Laosheng Wu^a ; ^c ; Jun Lou^a ; Zhigang Wu^d ; Renyi Liu^d ; Jianming Xu^a ; ^{jmxu@zju.edu.cn" class="auth_mail} ; Scott R. Yates^b ; ^{Scott.Yates@ars.usda.gov" class="auth_mail}
• 关键词：Escherichia coli O157 ; H7 (E. coli O157 ; H7) ; Survival ; Chloroflexi ; Amorphous Al2O3 ; pH
• 刊名：Science of the Total Environment
• 出版年：1 April, 2014
• 年：2014
• 卷：476-477
• 期：Complete
• 页码：49-56
• 全文大小：660 K

文摘

Escherichia coli O157:H7 (E. coli O157:H7) is an important food-borne pathogen, which continues to be a major public health concern worldwide. It is known that E. coli O157:H7 survive in soil environment might result in the contamination of fresh produce or water source. To investigate how the soils and their properties affect E. coli O157:H7 survival, we studied E. coli O157:H7 survival dynamics in 14 soils collected in eastern China from the warm-temperate zone to subtropical zone. Results showed that E. coli O157:H7 survival as a function of time can be well described by the Weibull model. The calculated t_d values (survival time to reach the detection limit, 100 colony forming units per gram oven-dried weight of soil) for the test soils were between 1.4 and 25.8 days. A significantly longer survival time (t_d) was observed in neutral or alkaline soils from north-eastern China (the warm-temperate zone) than that in acidic soils from south-eastern China (the subtropical zone). Distinct E. coli O157:H7 survival dynamics was related to soil properties. Stepwise multiple regression analysis revealed that the t_d values were significantly enhanced by soil microbial biomass carbon and total nitrogen, but were significantly reduced by amorphous Al₂O₃ and relative abundance of Chloroflexi. It should pay more attention to E. coli O157:H7 long survival in soils and its potential environmental contamination risk.