Titre du document / Document title

Effects of cattle feeding regimen and soil management type on the fate of Escherichia coli O157:H7 and Salmonella enterica serovar typhimurium in manure, manure-amended soil, and lettuce

Auteur(s) / Author(s)

FRANZ Eelco ⁽¹⁾ ; VAN DIEPENINGEN Anne D. ⁽¹⁾ ; DE VOS Oscar J. ⁽¹⁾ ; VAN BRUGGEN Ariena H. C. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Biological Farming Systems Group, Department of Plant Sciences, Wageningen University and Research Center, Marijkeweg 22, 6709 PG Wageningen, PAYS-BAS

Résumé / Abstract

Survival of the green fluorescent protein-transformed human pathogens Escherichia coli O157:H7 and Salmonella enterica serovar Typhimurium was studied in a laboratory-simulated lettuce production chain. Dairy cows were fed three different roughage types: high-digestible grass silage plus maize silage (6:4), low-digestible grass silage, and straw. Each was adjusted with supplemental concentrates to high and low crude protein levels. The pathogens were added to manure, which was subsequently mixed (after 56 and 28 days for E. coli O157:H7 and Salmonella serovar Typhimurium, respectively) with two pairs of organically and conventionally managed loamy and sandy soil. After another 14 days, iceberg lettuce seedlings were planted and then checked for pathogens after 21 days of growth. Survival data were fitted to a logistic decline function (exponential for E. coli O157:H7 in soil). Roughage type significantly influenced the rate of decline of E. coli O157:H7 in manure, with the fastest decline in manure from the pure straw diet and the slowest in manure from the diet of grass silage plus maize silage. Roughage type showed no effect on the rate of decline of Salmonella serovar Typhimurium, although decline was significantly faster in the manure derived from straw than in the manure from the diet of grass silage plus maize silage. The pH and fiber content of the manure were significant explanatory factors and were positively correlated with the rate of decline. With E. coli O157:H7 there was a trend of faster decline in organic than in conventional soils. No pathogens were detected in the edible lettuce parts. The results indicate that cattle diet and soil management are important factors with respect to the survival of human pathogens in the environment.

Revue / Journal Title

Applied and environmental microbiology   ISSN 0099-2240   CODEN AEMIDF 

Source / Source

2005, vol. 71, n^o10, pp. 6165-6174 [10 page(s) (article)] (56 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Society for Microbiology, Washington, DC, ETATS-UNIS  (1976) (Revue)

Mots-clés anglais / English Keywords

Bacteria ; Enterobacteriaceae ; Survival ; Lettuce ; Pathogen strain ; Soil management ; Salmonella typhimurium ; Escherichia coli ; Soils ; Livestock ;

Mots-clés français / French Keywords

Bactérie ; Enterobacteriaceae ; Salmonella enterica serovar typhimurium ; Survie ; Laitue ; Souche pathogène ; Aménagement sol ; Salmonella typhimurium ; Escherichia coli ; Sol ; Bétail ;

Mots-clés espagnols / Spanish Keywords

Bacteria ; Enterobacteriaceae ; Sobrevivencia ; Lechuga ; Cepa patógena ; Acondicionamiento suelo ; Salmonella typhimurium ; Escherichia coli ; Suelo ; Ganado ;

Localisation / Location

INIST-CNRS, Cote INIST : 7195, 35400013274254.0620