title: Survival of Escherichia coli O157:H7 in soils from Jiangsu Province, China.
abstract: Escherichia coli O157:H7 (E. coli O157:H7) is recognized as a hazardous microorganism in the environment and for public health. The E. coli O157:H7 survival dynamics were investigated in 12 representative soils from Jiangsu Province, where the largest E. coli O157:H7 infection in China occurred. It was observed that E. coli O157:H7 declined rapidly in acidic soils (pH, 4.57 - 5.14) but slowly in neutral soils (pH, 6.51 - 7.39). The survival dynamics were well described by the Weibull model, with the calculated td value (survival time of the culturable E. coli O157:H7 needed to reach the detection limit of 100 CFU g(-1)) from 4.57 days in an acidic soil (pH, 4.57) to 34.34 days in a neutral soil (pH, 6.77). Stepwise multiple regression analysis indicated that soil pH and soil organic carbon favored E. coli O157:H7 survival, while a high initial ratio of Gram-negative bacteria phospholipid fatty acids (PLFAs) to Gram-positive bacteria PLFAs, and high content of exchangeable potassium inhibited E. coli O157:H7 survival. Principal component analysis clearly showed that the survival profiles in soils with high pH were different from those with low pH.
authors: College of Environmental and Natural Resource Sciences, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, China.
authors: Taoxiang
authors: T
authors: Zhang
authors: Haizhen
authors: H
authors: Wang
authors: Laosheng
authors: L
authors: Wu
authors: Jun
authors: J
authors: Lou
authors: Jianjun
authors: J
authors: Wu
authors: Philip C
authors: PC
authors: Brookes
authors: Jianming
authors: J
authors: Xu
mesh_terms: D002681:China; D019453:Escherichia coli O157 / Q000502:physiology*; D006863:Hydrogen-Ion Concentration; D050296:Microbial Viability; D012987:Soil; D012988:Soil Microbiology
chemical_list: D012987:Soil