Nine outbreaks of food poisoning caused by
Salmonella enteritidis occurred successively all over the old metropolitan area of Hyogo Ward and some part of Ikuta ward adjacent to it within the city limits of Kobe, Hyogo Prefecture, during 2 period of from June 22 to July 3, 1959. In these outbreaks were involved 34 persons, of whom 3 died.
S. enteritidis was detected, at the rate of 100 per cent, from the fecal specimens collected from the persons involved. When 1, 128 of 9, 028 rats caught within the city limits during the same period as mentioned above were examined for bacteria,
S. enteritidis was detected from 28 of 826 rats caught in and around the area where the persons involved had been reported (the rate of detection being 3.4 per cent). The same organism was detected from one of 302 rats caught in areas not related to that in which the involved persons had been found (the rate of detection being 0.3 per cent).
The isolated organisms were classified into two types, A and B, by means of phage typing. Type A was strongly virulent and type B weakly virulent for mice.
From he results of survey on the occurrence of patients involved in these outbreaks of food poisoning and those of detection of bacteria from rats caught in and around the related area, it was presumed that there had been an epizootic of
S. enteritidis infection among rats in the area where the persons involved had been reported and that outbreaks of food poisoning had occurred intensively on account of the food contaminated by rats harboring the causative organisms in individual houses from which the patients were detected.
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