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Rectoanal Junction Colonization of Feedlot Cattle by Escherichia coli O157:H7 and Its Association with Supershedders and Excretion Dynamics

Cobbold, Rowland N ; Hancock, Dale D ; Rice, Daniel H ; Berg, Janice ; Stilborn, Robert ; Hovde, Carolyn J ; Besser, Thomas E

Applied and Environmental Microbiology, 2007-03, Vol.73 (5), p.1563-1568 [Periódico revisado por pares]

Washington, DC: American Society for Microbiology

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Título:
Rectoanal Junction Colonization of Feedlot Cattle by Escherichia coli O157:H7 and Its Association with Supershedders and Excretion Dynamics
Autor: Cobbold, Rowland N ; Hancock, Dale D ; Rice, Daniel H ; Berg, Janice ; Stilborn, Robert ; Hovde, Carolyn J ; Besser, Thomas E
Assuntos: Anal Canal - microbiology ; Animal Feed ; animal pens ; Animals ; anus ; bacterial colonization ; Bacteriology ; Biological and medical sciences ; Cattle ; Cattle Diseases - epidemiology ; Cattle Diseases - microbiology ; Colony Count, Microbial ; Correlation analysis ; E coli ; Escherichia coli ; Escherichia coli Infections - epidemiology ; Escherichia coli Infections - microbiology ; Escherichia coli Infections - veterinary ; Escherichia coli O157 ; Escherichia coli O157 - classification ; Escherichia coli O157 - genetics ; Escherichia coli O157 - growth & development ; Escherichia coli O157 - isolation & purification ; excretion ; Excretory system ; Feces ; Feces - microbiology ; feedlots ; food chain ; food contamination ; Fundamental and applied biological sciences. Psychology ; Microbiology ; population dynamics ; Prevalence ; Public Health Microbiology ; pulsed-field gel electrophoresis ; Rectum - microbiology ; serotypes
É parte de: Applied and Environmental Microbiology, 2007-03, Vol.73 (5), p.1563-1568
Notas: http://aem.asm.org/contents-by-date.0.shtml
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Corresponding author. Present address: School of Veterinary Science, University of Queensland, St. Lucia, QLD 4072, Australia. Phone: 61 7 3365 2087. Fax: 61 7 3365 1355. E-mail: r.cobbold@uq.edu.au.
Present address: Food Laboratory Division, New York State Department of Agriculture and Markets, Albany, NY 12235.
Descrição: Feedlot cattle were observed for fecal excretion of and rectoanal junction (RAJ) colonization with Escherichia coli O157:H7 to identify potential "supershedders." RAJ colonization and fecal excretion prevalences were correlated, and E. coli O157:H7 prevalences and counts were significantly greater for RAJ samples. Based on a comparison of RAJ and fecal ratios of E. coli O157:H7/E. coli counts, the RAJ appears to be preferentially colonized by the O157:H7 serotype. Five supershedders were identified based on persistent colonization with high concentrations of E. coli O157:H7. Cattle copenned with supershedders had significantly greater mean pen E. coli O157:H7 RAJ and fecal prevalences than noncopenned cattle. Cumulative fecal E. coli O157:H7 excretion was also significantly higher for pens housing a supershedder. E. coli O157:H7/E. coli count ratios were higher for supershedders than for other cattle, indicating greater proportional colonization. Pulsed-field gel electrophoresis analysis demonstrated that isolates from supershedders and copenned cattle were highly related. Cattle that remained negative for E. coli O157:H7 throughout sampling were five times more likely to have been in a pen that did not house a supershedder. The data from this study support an association between levels of fecal excretion of E. coli O157:H7 and RAJ colonization in pens of feedlot cattle and suggest that the presence of supershedders influences group-level excretion parameters. An improved understanding of individual and population transmission dynamics of E. coli O157:H7 can be used to develop preslaughter- and slaughter-level interventions that reduce contamination of the food chain.
Editor: Washington, DC: American Society for Microbiology
Idioma: Inglês

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Rectoanal Junction Colonization of Feedlot Cattle by Escherichia coli O157:H7 and Its Association with Supershedders and Excretion Dynamics

Cobbold, Rowland N ; Hancock, Dale D ; Rice, Daniel H ; Berg, Janice ; Stilborn, Robert ; Hovde, Carolyn J ; Besser, Thomas E

Washington, DC: American Society for Microbiology

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