Antibiotic Susceptibility of Bacteria Isolated from Pasteurized Milk and Characterization of Macrolide-Lincosamide-Streptogramin Resistance Genes

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Abstract:

The presence of antibiotic-resistant bacteria in pasteurized milk was detected by plating 18 milk samples on selective media containing β-lactams, macrolides, or a glycopeptide. Most samples contained gram-positive bacteria that grew on agar plates containing oxacillin, erythromycin, and/or spiramycin. The disk-diffusion method confirmed resistance to erythromycin and/or spiramycin in 86 and 65% of the coryneform bacteria and Micrococcaceae tested, respectively. PCR and sequence analysis revealed the presence of an ermC gene in 2 of the 25 Micrococcaceae strains investigated for their resistance to erythromycin and/or spiramycin. None of the 14 corynebacteria strains resistant to erythromycin and/or spiramycin harbored the erm (X) gene. No gene transfer could be demonstrated between the two erm (C) staphylococcal isolates and recipient strains of Enterococcus faecalis JH2-2 or Staphylococcus aureus 80CR5.

Document Type: Research Article

Affiliations: 1: Agence Française de Sécurité Sanitaire des Aliments, Laboratoire d'Etudes et de Recherche sur les Médicaments Vétérinaires et Désinfectants, Javené BP90203, 35302 Fougères, France 2: Agence Française de Sécurité Sanitaire des Aliments, Laboratoire d'Etudes et de Recherche sur les Médicaments Vétérinaires et Désinfectants, Javené BP90203, 35302 Fougères, France 3: Centre Hospitalier Universitaire Caen, Laboratoire de Microbiologie, Av. de la Cote de Nacre 14033, Caen cedex, France 4: Université René Descartes, Unité de Formation et de Recherche des Sciences Pharmaceutiques et Biologiques, 4 av. de l'observatoire, 75270 Paris cedex 06, France

Publication date: February 1, 2005

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