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Transferable tetracycline resistance in Listeria monocytogenes from food in Italy

Istituto Superiore di Sanità, Food Department, Viale Regina Elena, 299, 00161 Rome and *Department of Experimental Medicine, Microbiology Section, University of L'Aquila, L'Aquila, Italy

Corresponding author: Dr P. Aureli (e-mail: p.aureli{at}iss.it).

Received 10 Oct. 2001; revised version accepted 7 Feb. 2002.

Abstract

Mechanisms of tetracycline resistance were investigated in two recent Listeria monocytogenes isolates from food, with L. innocua 52P tet^r as a control. Tetracycline resistance was transferred conjugatively from all three strains to L. ivanovii and from one isolate and the control to Enterococcus faecalis. Molecular analysis demonstrated a chromosomal location for the tet determinant, which was identified as tetM in all cases. These studies are the first to show that L. monocytogenes from food could be a source of tetracycline resistance genes able to spread to other micro-organisms.

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