Volume 252, Issue 1 pp. 67-72

Antimicrobial susceptibility of nisin resistant Listeria monocytogenes of dairy origin

Beatriz Martínez

Corresponding Author

Beatriz Martínez

Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Carretera de Infiesto s/n, 33300 Villaviciosa, Asturias, Spain

*Corresponding author. Tel.: +34 985 89 33 59; fax: +34 985 89 22 33., E-mail address: [email protected]Search for more papers by this author
Ana Rodríguez

Ana Rodríguez

Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Carretera de Infiesto s/n, 33300 Villaviciosa, Asturias, Spain

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First published: 09 January 2006
Citations: 3

Edited by W. Kneifel

Abstract

The antibiotic susceptibility of wild Listeria monocytogenes strains and their corresponding nisin resistant variants was assessed. The resistant strains were more sensitive to most of the tested antibiotics than their wild-type counterparts. A slight increase in MIC was observed for a few antibiotics including the membrane disturbing polymixin B. Cross-resistance was detected with two synthetic antimicrobial peptides. A lower C15/C17 ratio in the membrane fatty acid composition of the nisin resistant strains was found, and one strain pair showed a significant difference in surface hydrophobicity. As judged by these results, no clear correlation could be established between resistance to nisin and to worldwide-used antibiotics.

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