The Conditions Necessary for Sufficient Isolation of Causative Organisms in Food Poisoning Outbreaks

概要

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We studied the conditions necessary for sufficient isolation of causative organisms using three methods with data on 123 outbreaks (4, 551 specimens) in Hiroshima Prefecture.<BR>1) By the isolation rate model, the isolation rate of causative organism was 26.9% (1, 009/3, 754) for all specimens, being 60.5% for feces of patients, 41.0% for leftovers, 34.6% for vomits, 22.7% for feces of food-handlers, 12.7% for remaining foods, and 11.7% for food materials.<BR>2) By the score model, the mean isolation rate for the causative-organism-known group (n = 90) was 6.59, and that for the unknown group was 5.39. The isolation rate of the causative organism for the outbreaks at over 7 points was 88.3%, but low for the outbreaks at less than 6 points was 58.7%. The results of the t-test showed significance at p<0.01 between the groups (score≥7 and ≤6).<BR>3) By the multiple logistic model, the odds ratio was 19.6 (95% confidence interval = 4.36-88.48) for the specimens from patients, 4.65 (1.66-12.99) for season of outbreak, and 7.90 (1.25-49.82) for the specimens from the food handlers.<BR>These findings suggest that 6-10 specimens of patient feces collected within 3rd-5th day of illness, more than 5 specimens of food or leftovers, and specimens of food handler feces must be obtained to reach a high isolation rate of the causative organism.
日本食品微生物学会の論文