Abstract
A total of 692 rats, mostly Rattus rattus, which had been trapped in restaurants and food shops within the nine buildings of central Tokyo during a period from August 1988 to March 1990, were examined for Listeria spp. organisms in the large intestine contents. The organisms were detected from 133 of 692 (19.2%) samples, ranging from 9.0 to 44.8% depending on the buildings. L. monocytogenes and L. innocua were isolated from 60 (8.8%) and 73 (10.5%) rats, respectively. The perdominant serotypes of 60 isolates of L. monocytogenes were 4b (21 strains), 1/2b (20 strains), and 1/2a (14 strains).
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