Organic or antibiotic-free labeling does not impact the recovery of enteric pathogens and antimicrobial-resistant escherichia coli from fresh retail chicken

Dixie F. Mollenkopf, Johana K. Cenera, Erin M. Bryant, Christy A. King, Isaac Kashoma, Anand Kumar, Julie A. Funk, Gireesh Rajashekara, Thomas E. Wittum

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

We investigated the implied health benefits of retail chicken breast labeled as "organic" or "antibiotic-free" when compared to conventional products based on frequency of contamination by Salmonella spp., Campylobacter spp., and coliform bacteria resistant to fluoroquinolones, extended-spectrum cephalosporins, or carbapenems. We purchased 231 prepackaged chicken breasts from 99 grocery stores representing 17 retail chains in Ohio, Michigan, and Pennsylvania from June to September 2012. Ninety-six (41.5%) packages were labeled "antibiotic free" and 40 (17.3%) were labeled "organic," with the remaining 95 (41.1%) making neither label claim. Salmonella were recovered from 56 (24.2%) packages, and the recovery rate was not different between product types. Five percent of packages contained Salmonella carrying the extended-spectrum cephalosporin resistance gene blaCMY-2, representing 21.4% of Salmonella isolates. Campylobacter spp. were recovered from 10.8% of packages, with observed recovery rates similar for the three product types. Using selective media, we recovered Escherichia coli harboring blaCMY-2 from over half (53.7%) of packages, with similar recovery rates for all product types. In addition, we recovered E. coli carrying blaCTX-M from 6.9% of packages, and E. coli with QRDR mutations from 8.2% of packages. Fluoroquinolone-resistant E. coli recovered using selective media were more common (p<0.05) in conventional (18.9%) compared to organic (0) and antibiotic-free (2.1%) packages. Our results indicate that, regardless of product type, fresh retail chicken breast is commonly contaminated with enteric pathogens associated with foodborne illness and commensal bacteria harboring genes conferring resistance to critically important antimicrobial drugs.

Original languageEnglish (US)
Pages (from-to)920-929
Number of pages10
JournalFoodborne Pathogens and Disease
Volume11
Issue number12
DOIs
StatePublished - Dec 1 2014
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Food Science
  • Applied Microbiology and Biotechnology
  • Animal Science and Zoology

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