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Title: 2001 NARMS REPORT OF SALMONELLA NEWPORT SLAUGHTER ISOLATES

Author
item Tankson, Jeanetta
item Cray, Paula
item HEADRICK, MARCIA - USDA-CVM

Submitted to: National Antimicrobial Resistance Monitoring System Scientific Meeting
Publication Type: Proceedings
Publication Acceptance Date: 5/23/2003
Publication Date: 6/23/2003
Citation: Tankson, J.D., Cray, P.J., Headrick, M. 2003. 2001 narms report of salmonella newport slaughter isolates. National Antimicrobial Resistance Monitoring System Scientific Meeting. P26:44.

Interpretive Summary:

Technical Abstract: From 2000 - 2001, data collected as part of the animal arm of the National Antimicrobial Resistance Monitoring System - Enteric Bacteria (NARMS) indicated that Salmonella Newport was among the top 10 serotypes recovered from animal sources regardless of clinical status. In 2001, NARMS reported a total of 119 Newport slaughter isolates. Using the Sensititre**TM semi-automated system and a custom made antimicrobial panel, 42 (35%) isolates were pan-susceptible whereas 77 (65%) were multi-drug resistant (MDR; MDR defined as resistance to 2 or more antimicrobials). Of the 77 MDR isolates, 66 (86%) were from cattle, 6 (8%) from swine, and 5 (6%) from poultry. Of the 42 pan-susceptible isolates, 22 (52%) were from cattle, 19 (45%) from poultry, and 1 (2%) from swine. Pulsed-field gel electrophoresis (PFGE), plasmid profiling, and probes for int1, int2, int3, and int4, were used to further characterize the isolates. The rapid emergence of the MDR Salmonella Newport suggests that numbers of resistant genes were readily acquired and that clonal spread has occurred in the US.