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United States Department of Agriculture

Agricultural Research Service

Research Project: EPIDEMIOLOGY, ECOLOGY, AND MOLECULAR GENETICS OF ANTIMICROBIAL RESISTANCE IN PATHOGENIC AND COMMENSAL BACTERIA FROM FOOD ANIMALS Title: Antimicrobial resistance in Salmonella isolates recovered from swine: A NARMS report

Authors
item Cray, Paula
item Dargatz, David - USDA-APHIS
item Anandaraman, Neena - USDA-FSIS
item Wineland, Nora - USDA-APHIS
item Frye, Jonathan
item Bailey, Joseph

Submitted to: Safepork
Publication Type: Proceedings
Publication Acceptance Date: March 9, 2007
Publication Date: May 9, 2007
Citation: Cray, P.J., Dargatz, D.A., Anandaraman, N., Wineland, N.E., Frye, J.G., Bailey, J.S. 2007. Antimicrobial resistance in Salmonella isolates recovered from swine: A NARMS report. Safepork. 7:510-513.

Technical Abstract: In 1996 the Food and Drug Administration Center for Veterinary Medicine established the National Antimicrobial Resistance Monitoring System – Enteric Bacteria (NARMS) as a post-approval monitoring program. From 1997 through 2005 10,565 Salmonella isolates originated from swine slaughter/processing (n=3,848), diagnostic (n=4,579) and on-farm (n=2138) sources as part of the animal arm of NARMS. Relative to 2005, the top five Salmonella serotypes from slaughter/processing (in decreasing frequency) were S. Derby, S. Typhimurium var. 5-, S. Infantis, S. Anatum, and S. Johannesburg while diagnostic serotypes were S. Typhimurium var. 5-, S. Choleraesuis var. kunzendorf, S. Derby, S. Typhimurium, and S. Heidelberg. Increased antimicrobial resistance was most often observed for diagnostic versus slaughter/processing isolates although there were exceptions for some drug and serotype combinations. For all years, > 55% of the slaughter/processing isolates were either pan-susceptible or resistant to only one antimicrobial, which was most often tetracycline. Since 1997, approximately 41% of the isolates exhibited multi-drug resistance, defined as resistance to is greater than or equal to antimicrobials. Of the 723 S. Typhimurium DT104 isolates from swine only 24% (n=176) originated from slaughter/processing. These data reaffirm that overall patterns of resistance are highly dependent on the Salmonella serotype distribution and is variable when measured at different points along the farm to fork continuum.

Last Modified: 10/22/2014
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