Survival of Enterohemorrhagic Escherichia coli O104:H4 Strain C227/11Φcu in Agricultural Soils Depends on rpoS and Environmental Factors

• Published in: Pathogens (Basel) Vol. 10; no. 11; p. 1443
• Main Authors: Detert, Katharina, Schmidt, Herbert
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 05.11.2021; MDPI
• Subjects: Agricultural land; agricultural soil; Biofilms; C227/11Φcu; Cattle; Cattle manure; Cloning; Deletion; Deletion mutant; E coli; EHEC/EAEC; Environmental factors; Escherichia coli; Fertilizers; Food chains; Food contamination; Food contamination & poisoning; Genes; Infections; Laboratories; Manures; Microenvironments; O104:H4; Pathogens; Plasmids; rpoS; Soil contamination; Soils; Survival
• ISSN: 2076-0817; 2076-0817
• DOI: 10.3390/pathogens10111443

The consumption of contaminated fresh produce caused outbreaks of enterohemorrhagic (EHEC) Escherichia coli. Agricultural soil might be a reservoir for EHEC strains and represent a contamination source for edible plants. Furthermore, the application of manure as fertilizer is an important contamination route. Thus, the German fertilizer ordinance prohibits the use of manure 12 weeks before crop harvest to avoid pathogen transmission into the food chain. In this study, the survival of E. coli O104:H4 strain C227/11Φcu in soil microenvironments with either diluvial sand or alluvial loam at two temperatures was investigated for more than 12 weeks. It was analyzed whether the addition of cattle manure extends EHEC survival in these microenvironments. The experiments were additionally performed with isogenic ΔrpoS and ΔfliC deletion mutants of C227/11Φcu. The survival of C227/11Φcu was highest at 4 °C, whereas the soil type had a minor influence. The addition of cattle manure increased the survival at 22 °C. Deletion of rpoS significantly decreased the survival period under all cultivation conditions, whereas fliC deletion did not have any influence. The results of our study demonstrate that EHEC C227/11Φcu is able to survive for more than 12 weeks in soil microenvironments and that RpoS is an important determinant for survival.