title: Clay mineral type effect on bacterial enteropathogen survival in soil.
abstract: Enteropathogens released into the environment can represent a serious risk to public health. Soil clay content has long been known to have an important effect on enteropathogen survival in soil, generally enhancing survival. However, clay mineral composition in soils varies, and different clay minerals have specific physiochemical properties that would be expected to impact differentially on survival. This work investigated the effect of clay materials, with a predominance of a particular mineral type (montmorillonite, kaolinite, or illite), on the survival in soil microcosms over 96 days of Listeria monocytogenes, Salmonella Dublin, and Escherichia coli O157. Clay mineral addition was found to alter a number of physicochemical parameters in soil, including cation exchange capacity and surface area, and this was specific to the mineral type. Clay mineral addition enhanced enteropathogen survival in soil. The type of clay mineral was found to differentially affect enteropathogen survival and the effect was enteropathogen-specific.
authors.affiliation: Teagasc Environmental Research Centre, Johnstown Castle, Wexford, Ireland; The James Hutton Institute, Cragiebuckler, Aberdeen AB158QH, United Kingdom. Electronic address: Fiona.brennan@hutton.ac.uk.
authors.forename: Fiona P
authors.initials: FP
authors.lastname: Brennan
authors.forename: Emma
authors.initials: E
authors.lastname: Moynihan
authors.forename: Bryan S
authors.initials: BS
authors.lastname: Griffiths
authors.forename: Stephen
authors.initials: S
authors.lastname: Hillier
authors.forename: Jason
authors.initials: J
authors.lastname: Owen
authors.forename: Helen
authors.initials: H
authors.lastname: Pendlowski
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Avery
mesh_terms: D000538:Aluminum Silicates / Q000032:analysis* / Q000494:pharmacology; D001546:Bentonite; D000077215:Clay; D019453:Escherichia coli O157 / Q000187:drug effects* / Q000254:growth & development; D007494:Ireland; D007616:Kaolin; D008089:Listeria monocytogenes / Q000187:drug effects* / Q000254:growth & development; D008903:Minerals; D019779:Salmonella enterica / Q000187:drug effects* / Q000254:growth & development; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D016019:Survival Analysis; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D008903:Minerals; D012987:Soil; C099089:illite; D001546:Bentonite; D007616:Kaolin; D000077215:Clay
keywords: Clay mineral; Escherichia coli; Listeria; Pathogen survival; Salmonella