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Variations of Escherichia coli O157:H7 Survival in Purple Soils

Author

Listed:
  • 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)

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.

Suggested Citation

  • Taoxiang Zhang & Suping Hu & Wenhao Yang, 2017. "Variations of Escherichia coli O157:H7 Survival in Purple Soils," IJERPH, MDPI, vol. 14(10), pages 1-10, October.
    • Handle: RePEc:gam:jijerp:v:14:y:2017:i:10:p:1246-:d:115538
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