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Plasmid-Mediated Resistance to Antimicrobial Agents among Listeriae

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The resistance to 14 antiseptic-disinfectant and dye compounds of 208 strains of Listeria (132 L. monocytogenes, 63 L. innocua, 8 L. seeligeri, 1 L. ivanovii, 1 L. welshimeri, and 3 Listeria spp.) was tested by the agar-dilution procedure. The Listeria strains were isolated from different varieties of foods, environments of cheese dairies, humans, and wild birds. A total of 14 (6.7%) Listeria strains (12 L. monocytogenes and 2 L. innocua) were resistant to benzalkonium chloride, hexarmidine diisethionate, and ethidium bromide. This multiple resistance was observed more frequently from strains of Listeria spp. detected on carcasses of poultry (47%) than strains isolated from human listeriosis cases or carriers (11.5%), red meats (10%), cheeses (5.4%), wild birds (0.9%), and environments of cheese dairies (0%). Among resistant strains, 10 groups of strains (71.5%) were differentiated by serogroup, phage typing, and sensitivity or resistance to cadmium. Extrachromosomal DNA was found in all resistant strains and was transferred at a high frequency among Listeria spp. (8.7 × 10−6 to 1 × 10−3 transconjugant CFUs per one donor CFU). These resistances were also transferable between L. monocytogenes and Staphylococcus aureus with similar transfer frequencies (7.8 × 10−6 to 1 × 10−4) and between strains of Staphylococcus aureus with similar transfer frequencies from 8 × 10−7 to 3.3 × 10−6. These results suggest that emergence of this multiple resistance in Listeria spp. could be due to acquisition of a replicon originating in staphylocci.

Document Type: Research Article

Affiliations: 1: Laboratoire de Microbiologie, Faculté de Pharmacie, Université de Bourgogne, 7, boulevard Jeanne d'Arc, 21033 Dijon Cedex, France 2: Laboratoire de Microbiologie U.A. INRA, ENSBANA, Université de Bourgogne, 1, esplanade Erasme, 21000 Dijon, France

Publication date: 1998-11-01

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