Variations of Escherichia coli O157:H7 Survival in Purple Soils

Taoxiang Zhang, Suping Hu and Wenhao Yang
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Taoxiang Zhang: College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Suping Hu: College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Wenhao Yang: Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China

IJERPH, 2017, vol. 14, issue 10, 1-10

Abstract: Escherichia coli O157:H7 is a well-recognized cause of human illness. Survival of Escherichia coli O157:H7 in five purple soils from Sichuan Province was investigated. The dynamics of E. coli O157:H7 survival in purple soils were described by the Weibull model. Results showed that this model is suitable to fit survival curves of E. coli O157:H7 in purple soils, with the calculated t d value (survival time needed to reach the detection limit of 100 CFU?g ?1 ) ranging from 2.99 days to 26.36 days. The longest survival time of E. coli O157:H7 was observed in neutral purple soils (24.49 days), followed by alkalescent purple soil (18.62 days) and acid purple soil (3.48 days). The redundancy analysis (RDA) revealed that t d values were significantly enhanced by soil nutrition (total organic carbon (OC), total nitrogen (TN), available potassium (AK) and the ratio of humic acid to fulvic acid (Ha/Fa)), but were significantly suppressed by iron and aluminum oxide.

Keywords: Escherichia coli O157:H7 ( E. coli O157:H7); purple soils; Weibull model; soil nutrition; iron and aluminum oxide (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
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