Abstract
Clostridioides difficile is a human pathogen that is ubiquitous in soil. Despite increasing infection rates and evidence of foodborne transmission, there is limited data on prevalence in soil or which factors influence persistence. The aim of this study was to investigate the prevalence of these bacteria in soil from three different spinach fields and to examine the chemical composition (carbon, organic carbon, nitrogen, organic matter, minerals and pH) and microbiota to gain insight into the factors that may promote/inhibit C. difficile. The overall C. difficile prevalence (10%) was lower than expected (based on international studies) and a significantly (P < 0.05) higher prevalence was obtained in Field 3 (20%) as compared to Fields 1 and 2 (5% each). Analysis of the soil suggested that the pH as well as organic matter, calcium and phosphorus content directly and indirectly (via the microbiota) influenced the prevalence of C. difficile inadjacent fields, where other factors (eg. climate) are similar. Although further studies are required to validate our findings, the data provides the first step in developing potential soil based control strategies.
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