EPIDEMIOLOGY, ECOLOGY, AND MOLECULAR GENETICS OF ANTIMICROBIAL RESISTANCE IN PATHOGENIC AND COMMENSAL BACTERIA FROM FOOD ANIMALS
Location: Bacterial Epidemiology and Antimicrobial Resistance
Title: Antimicrobial resistance in campylobacter jejuni and campylobacter coli isolated from chicken carcass rinstates
Submitted to: Annual Conference of Antimicrobial Resistance
Publication Type: Abstract Only
Publication Acceptance Date: May 26, 2006
Publication Date: June 28, 2006
Citation: Cray, P.J., Plumblee, J., Anandaraman, N., Rose, B., Salamone, B., Englen, M.D., Meinersmann, R.J. 2006. Antimicrobial resistance in campylobacter jejuni and campylobacter coli isolated from chicken carcass rinsates. Annual Conference of Antimicrobial Resistance. June 26-28, 2006. Bethesda, MD.
Background: The development of antimicrobial resistance in Campylobacter species, particularly C. jejuni and C. coli, is of public health concern. Methods: Campylobacter isolates recovered from spent chicken carcass rinsates collected at federally inspected slaughter establishments were submitted to the animal arm of the National Antimicrobial Resistance Monitoring System –Enteric Bacteria (NARMS). Antimicrobial susceptibility profiles were determined to eight antimicrobials including Azithromycin, Chloramphenicol, Ciprofloxacin, Clindamycin, Erythromycin, Gentamicin, Nalidixic Acid, and Tetracycline. Minimal inhibitory concentrations (MICs) were obtained using E-test (AB Biodisk) from 1998 through 2004. In 2005, a semi-automated broth microdilution system (Trek Diagnostics, Inc.) was used and two additional antimicrobials, Florfenicol and Telithromycin, were added. MIC50s and MIC90s were calculated for each year. Results and Summary: From 1998 through 2004, the MIC50s and MIC90s for C. jejuni and C. coli either remained unchanged or declined. The most dramatic decline was observed for MIC50s to Tetracycline (the 1998 MIC50 was 256 ug/ml for both C. jejuni and C. coli while in 2004 the MIC50 was 0.75 ug/ml for C. jejuni and 2 ug/ml for C. coli). The MIC50s for 2005 were within 1-2 dilutions of the 2004 numbers. Overall, the percent resistance, regardless of antimicrobial, was higher for C. coli compared to C. jejuni.