Fish and kitchen utensils were examined for contamination with enteritis vibriones in Saitama Prefecture over a year beginning with August, 1962.
The organisms were detected from 26.8 per cent of the fish samples collected. They were found in the gills, on the surface of the body, in the intestine, and in the flesh as arranged in the decreasing order of frequency. The rate of positive detection was 23.8 per cent at the highest among the kitchen utensils examined. It was 2.0 per cent among fecal specimens collected.
A total of 295 strains were isolated from fish and other seafoods. Of them, 234 strains were of biological type II and 55 strains of biological type I. Twenty-nine strains, either of biological type or of serological type, belonged to the food-poisoning type and were originated mostly from the gills and intestine.
Of 75 strains isolated from kitchen utensils and equipment, 9 and 63 strains were of biological types I and II, respectively. They included 2 strains belonging to the food-poisoning type.
The rate of positive detection from fish was 8.9 per cent in winter and 11.3 per cent in spring, 38.8 per cent in autumn, and 44.0 per cent in summer, and that from kitchen utensils was 1.6, 1.1, 14.9, and 26.4 per cent in the seasons arranged in the same order as above.
This rate from fish was 8.4 per cent when temperature was 10°C or below, and increased with a rise of temperature; that from kitchen utensils was less than 5 per cent when temperature was 20°C or below, and 23.5 per cent when it was over 26°C.
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