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. 2005 Jul;71(7):4108-11.
doi: 10.1128/AEM.71.7.4108-4111.2005.

Prevalence and antimicrobial resistance of Campylobacter spp. and Salmonella serovars in organic chickens from Maryland retail stores

Shenghui Cui  1 , Beilei Ge, Jie Zheng, Jianghong Meng
Affiliations

Prevalence and antimicrobial resistance of Campylobacter spp. and Salmonella serovars in organic chickens from Maryland retail stores

Shenghui Cui et al. Appl Environ Microbiol. 2005 Jul.

Abstract

Retail organic (n = 198) and conventional (n = 61) chickens were analyzed. Most organic (76%) and conventional (74%) chickens were contaminated with campylobacters. Salmonellae were recovered from 61% of organic and 44% of conventional chickens. All Salmonella enterica serovar Typhimurium isolates from conventional chickens were resistant to five or more antimicrobials, whereas most S. enterica serovar Typhimurium isolates (79%) from organic chickens were susceptible to 17 antimicrobials tested.

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Figures

FIG. 1.
FIG. 1.
Dendrogram of PFGE of Salmonella isolates recovered from organically and conventionally produced chicken samples. The tree of relative genetic similarity was constructed based on the neighbor-joining method; scale at 100 means identical. The numbers under columns organic and conventional are the numbers of chicken samples from which each serotype was recovered.
FIG. 2.
FIG. 2.
Antimicrobial resistance of campylobacters isolated from 150 organic (cross-hatch bars) and 45 conventional (solid bars) chickens. Abbreviations: CHL, chloramphenicol; CIP, ciprofloxacin; ERY, erythromycin; TET, tetracycline. An asterisk indicates a significant difference.
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