During the period from July 1970 to February 1975, the minimum inhibitory concentration (MIC) of 15 chemotherapeutic drugs (gentamicin, amikacin, dibekacin, tobramycin, streptomycin, kanamycin, chloramphenicol, minocycline, cefazolin, cephaloridine, cephalexin, ampicillin, sulbenicillin, furatrizine and nalidixic acid) to 200
Serratia marcescens strains isolated from various clinical materials was investigated by using agar plate dilution method, and the results were as follows.
1. Most strains of pigment-nonproducing were more resistant to 15 chemotherapeutics than pigmentproducing strains, whereas 6 pigment-nonproducing strains (amikacin 1, gentamicin 1, sulbenicillin1, nalidixicacid3) were inhibited by the MIC of lesst han 0.20μg/ml On the other hand, only onepigment-producing strain (kanamycin) was inhibited under the same concentration.
2. In the susceptibility test of
S. marcescens strains isolated from various clinical materials, resistant strains to the all chemotherapeutics tested were found mainly in isolates from urine and most of them were pigment-nonproducing.
3.
S. marcescens strains were most sensitive to gentamicin and furatrizine, followed to amikacin, tobramycin and dibekacin, while not sensitive to penicillins, cephalosporins and chloramphenicol
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