title: Validation of a Previously Developed Geospatial Model That Predicts the Prevalence of Listeria monocytogenes in New York State Produce Fields.
abstract: Technological advancements, particularly in the field of geographic information systems (GIS), have made it possible to predict the likelihood of foodborne pathogen contamination in produce production environments using geospatial models. Yet, few studies have examined the validity and robustness of such models. This study was performed to test and refine the rules associated with a previously developed geospatial model that predicts the prevalence of Listeria monocytogenes in produce farms in New York State (NYS). Produce fields for each of four enrolled produce farms were categorized into areas of high or low predicted L. monocytogenes prevalence using rules based on a field's available water storage (AWS) and its proximity to water, impervious cover, and pastures. Drag swabs (n = 1,056) were collected from plots assigned to each risk category. Logistic regression, which tested the ability of each rule to accurately predict the prevalence of L. monocytogenes, validated the rules based on water and pasture. Samples collected near water (odds ratio [OR], 3.0) and pasture (OR, 2.9) showed a significantly increased likelihood of L. monocytogenes isolation compared to that for samples collected far from water and pasture. Generalized linear mixed models identified additional land cover factors associated with an increased likelihood of L. monocytogenes isolation, such as proximity to wetlands. These findings validated a subset of previously developed rules that predict L. monocytogenes prevalence in produce production environments. This suggests that GIS and geospatial models can be used to accurately predict L. monocytogenes prevalence on farms and can be used prospectively to minimize the risk of preharvest contamination of produce.
authors.affiliation: Department of Food Science, Cornell University, Ithaca, New York, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Weller
authors.affiliation: Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, North Dakota, USA.
authors.forename: Suvash
authors.initials: S
authors.lastname: Shiwakoti
authors.affiliation: Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, North Dakota, USA.
authors.forename: Peter
authors.initials: P
authors.lastname: Bergholz
authors.affiliation: Department of Population Medicine and Diagnostic Science, Cornell University, Ithaca, New York, USA.
authors.forename: Yrjo
authors.initials: Y
authors.lastname: Grohn
authors.affiliation: Department of Food Science, Cornell University, Ithaca, New York, USA.
authors.forename: Martin
authors.initials: M
authors.lastname: Wiedmann
authors.affiliation: Department of Food Science and Technology, Eastern Shore Agricultural Research and Extension Center, Virginia Polytechnic University, Painter, Virginia, USA lstrawn@vt.edu.
authors.forename: Laura K
authors.initials: LK
authors.lastname: Strawn
mesh_terms: D000383:Agriculture; D003198:Computer Simulation / Q000592:standards / Q000706:statistics & numerical data; D018556:Crops, Agricultural / Q000382:microbiology*; D005506:Food Contamination / Q000517:prevention & control*; D005516:Food Microbiology; D040362:Geographic Information Systems / Q000592:standards; D008089:Listeria monocytogenes / Q000302:isolation & purification*; D009518:New York; D015995:Prevalence