BACTERIA ISOLATED FROM SURGICAL INFECTIONS AND THEIR SUSCEPTIBILITIES TO ANTIMICROBIAL AGENTS

SPECIAL REFERENCES TO BACTERIA ISOLATED BETWEEN JULY 1995 AND JUNE 1996

Abstract

Isolated bacteria from infections in general surgery during the period from July 1994 to June 1995 were investigated in a multicenter study in Japan, and the following results were obtained.
One hundred and sixty-four strains were isolated from primary infections, and 202 strains were isolated from postoperative infections. From primary infections, anaerobic Gram-positive bacteria were predominant, while from post operative infections, aerobic Gram-positive bacteria were predominant. Among aerobic Gram-positive bacteria, the isolation rate of Enterococcus faecalis was the highest, followed by that of Staphylococcus aureus from postoperative infections. Among anaerobic Gram-positive bacteria, the isolation rate of Peptostreptococcus spp. was the highest from both types of infections. Among aerobic Gram-negative bacteria, Escherichia coli was the most predominantly isolated from primary infections, fllowed by Klebsiellap neumoniae and Pseudomonas aemginosain this order, and from postoperative infections, P. aeruginosa was the most predominantly isolated, followed by Entembacter spp. and Klebsiella spp. Among anaerobic Gram-negative bacteria, the isolation rate of Bacteroides fragilis group was the highest from both types of infbctions.
We noticed that MICs of cefazolin against three out of 23 strains of E. coli were higher than 100μg/ml. Among anaerobic bacteria, there were many resistant strains against penicillins and cephems with MICs higher than100μg/ml, and the same trend was observed among other Bacteroides spp.and Prevotella spp.