Abstract
In order to elucidate some aspects of the epidemiology of listeriosis in Switzerland, 181 strains of Listeria monocytogenes isolated from humans, animals, food, and the environment have been analyzed by multilocus enzyme electrophoresis at 21 enzyme loci. The clone responsible for several recent food-borne outbreaks in Switzerland and in North America (marked by electrophoretic type 1 and serovar 4b) has been found frequently among strains isolated from animals. Thus, animals may represent a major source of diffusion of this clone in the environment and in food, in which it has been found only sporadically, however. Two other unrelated clones (including strains belonging to serovars 1/2b and 1/2c) have often been isolated from meat but not from animals. These findings indicate that contamination of meat with L. monocytogenes might originate mainly from the environment in which it is processed rather than from animals themselves. This could explain the differences in the distribution of L. monocytogenes serovars isolated from meat and from animals.
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