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United States Department of Agriculture

Agricultural Research Service

Title: Antibiotic Resistance in Salmonella Enterica Serotypes Heidelberg, Kentuckyand Thompson Isolated from Human and Broiler Chicken Sources

item Hollinger, K - FDA
item Silters, L - FDA
item Cray, Paula
item Angulo, F - USDA
item Tollefson, L - FDA
item Stamey, K - USDA

Submitted to: Interscience Conference on Antimicrobial Agents & Chemotherapy Proceedings
Publication Type: Proceedings
Publication Acceptance Date: June 1, 1999
Publication Date: September 26, 1999
Citation: Hollinger, K., Silters, L., Cray, P.J., Angulo, F., Tollefson, L., Stamey, K. 1999. Antibiotic resistance in salmonella enterica serotypes heidelberg, kentuckyand thompson isolated from human and broiler chicken sources.Interscience Conference on Antimicrobial Agents & Chemotherapy Proceedings. C1. 719. P. 101.

Technical Abstract: In 1998, National Antimicrobial Resistance Monitoring Systems (NARMS) isolates were susceptibility tested to 17 antibiotics by SensititreTM microbroth dilution. Comparison of serotypes among all animal species indicated that Salmonella Heidelberg(H), Kentucky(K) and Thompson(T) were most often isolated from broilers, accounting for 55.0% of broiler and 8.0% of human isolates. Human serotypes were separated into two groups: HKT (n=107), non-HKT (n=1330). Comparison between the two human groups indicated similar prevalence of resistance for all antibiotics tested except for: chloramphenicol, gentamicin, kanamycin, and streptomycin. The largest difference between human groups was observed for gentamicin where 15.9% of the HKT group and 1.8% of the non-HKT group were resistant; the HKT group was more similar to the broiler isolates, (15.5%). Comparison of human HKT and broiler groups indicated similarity in prevalence of resistance for all antibiotics except kanamycin where broiler prevalence (3.2%) was more similar to the human non-HKT (5.2%) The higher prevalence of gentamicin resistance between human groups was a discrepancy not seen with other antibiotics. In the broiler industry there is injection of broiler eggs with gentamicin prior to hatch. The greater proportion of gentamicin resistance in persons ill with salmonella and submitting isolates to NARMS occurred in serotypes that were predominantly isolated from broilers.

Last Modified: 4/19/2015
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