Abstract
A total of 74 isolates of Listeria (53 L. monocytogenes, ten L. innocua, three L. ivanovii, six L. welshimeri and two L. seligeri) were evaluated for their ability to grow in the presence of 100 μg ml −1 sodium arsenite. Six L. monocytogenes and one L. innocua strains were arsenite-resistant. There appeared to be a relationship between arsenite resistance and serotype, with five of the six arsenite-resistant strains of L. monocytogenes being serotype 4, and the incidence of arsenite resistance being substantially higher in type 4 L. monocytogenes than type 1 (63% vs 3%). Plasmid profiles of selected strains indicated that arsenite resistance is not a plasmid-linked trait in Listeria.
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