尿路感染症原因菌としてのEscherichia coliの由来とその性状に関する研究
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概要
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Biologic and serologic properties of Escherichia coli strains isolated concurrently from the urine and stool in 63 cases of urinary tract infections were studied with the findings as follows ; (1) Type O E. coli isolates from the urine included nine different serotypes : 1, 4, 6, 7, 14, 19, 21, 28 and 75, whereas those obtained from the feces showed fourteen serotypes, i. e. 1, 2, 4, 6, 7, 8, 11, 14, 15, 19, 28, 40, 75 and 80.(2) Types O-4 and O-6 were conspicuously frequent, accounting respectively for 19.3 and 35.4 % of all the serologically identifiable isolates from the urine.(3) The most frequent serotype among all the serologically identified fecal isolates was O-2, accounting only for 13.1 % ; hence moreover low rates for the remaining 13 types.(4) Among the pairs of E, coli isolates obtained concurrently from the urine and stool in 41 cases, 17.0 % proved to be serologically identical.(5) Antibiotic sensitivity tests conducted by the dilution technique revealed that 61.9 of the urinary isolates and 41.4% of the fecal isolates were resistant to chloramphenicol, streptomycin and tetracycline, showing MIC values over 50mcg per ml .(6) A little more than a half of the urinary isolates, 51.4 %, were hemolytic for humanred cells whilst only 12.1 % of the stool isolates proved to have such activity .(7) The hemolytic activity for human erythrocytes was demonstrable with 82.3 % of types O-4 and O-6 isolates from the urine. The corresponding ratio with the same serotype population from the stool was as low as 33.3 %.(8) Sixty-eight and a half percent of the urinary isolates and only 24.2 % of the fecal isolates were found to cause hemolysis of sheep red blood cells.(9) The De-tests with lapine intestine in vitro were positive with 27.6 % of the urinary isolates and with 5.0 % of the fecal isolates.(10) Of the types O-4 and O-6 isolates from the urine, 46.1%were demonstrated to show positive De-tests whereas none of the isolates of the same serotypes from the stool proved to give a positive De-tests.
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