赤痢集団発生の原因となった水道水からのShigella sonnei 1の検出
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In june, 1966, there was an outbreak of a water-borne epidemic of bacillary dysentery, in 4 areas of a city in Gunma Prefecture. The prevalence began on June 22 and came to an end on July 9, and 455 patients were detected. All of the isolated strains from patients were identified as Shigella sonnei phase 1, Col type 6 and 92.4% of which were tetracycline (TC) factors.The four epidemic areas were supplied with two systems of public water derived from two wells independently. The two wells were located closely, 29m apart from each other. The wells were contaminated by sewage whic had leaked out from a sewer pipe, and this was considered as the cause of water-borne bacillary dysentery.The water from the supplying system which was suggested to be contaminated, was collected out at various time, and was examined bacteriologically. In the cause of sampling, it was able to isolated two cultures of Shigella sonnei phase 1, Col type 6 with R (TC) factor from 100ml of a sample which was collected 5 days before the outbreak. From other samples were detected Escherichia coli but not dysenteric bacilli.In the previous records of outbreak of water-borne disease, their nature and causation are not always clear. And the causative bacteria could not be confirmed directly from the comtaminated water.As is apparent in this report, the authers were able to detect Shigella sonnei from the water supply which was the cause of water-borne bacillary dysentery, and proved that the characters of isolated strains from patients and that from water were identical.
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