Antimicrobial resistance, including plasmid-mediated resistance, among Bacteroides fragilis group species is well documented. A 5-year (1990-1994) prospective, eight-center survey of 3,177 clinical isolates of Bacteroides species was undertaken to review trends in resistance, using the breakpoints for full and intermediate susceptibility established by the National Committee for Clinical Laboratory Standards. No documented resistance to either metronidazole or chloramphenicol was found in this survey. Among B. fragilis isolates virtually no resistance was seen to imipenem, meropenem, ampicillin/sulbactam, piperacillin/tazobactam, or ticarcillin/clavulanate. Significant increases in resistance among B. fragilis isolates to cefotetan, ceftizoxime, and clindamycin (p < .01) were noted. Resistance to cefoxitin remained unchanged. Among the non-fragilis species of the B. fragilis group, there was virtually no resistance to imipenem, meropenem, chloramphenicol, or metronidazole. The three beta-lactamase inhibitors had increasing levels of resistance, although 95%-98% of strains were susceptible (p < .05). There was a significant decline in cefoxitin, cefmetazole, and clindamycin activity over time against these strains (p <.01). There was a significant (P < .001) increase in geometric mean minimum inhibitory concentration for most drugs and species tested from 1990 to 1994. Clusters in the eight institutions could not account for this rise in resistance. This survey demonstrates that rates of resistance of B. fragilis and non-fragilis species of B. fragilis group are increasing.

Bacteroides↗

PubMed1990

Norfloxacin use in urinary tract infection by urologists and infectious disease specialists.

One hundred thirty-one patients of urologists and infectious disease specialists were entered into an open trial of norfloxacin in the therapy of urinary tract infections (UTIs). All patients were evaluable for tolerability and 98 were evaluable for efficacy. The patient population in this study was older (mean age 53 years) and had more underlying urogenital disorders (30%) or recent invasive urologic procedures (20%) than the typical patient population with UTIs. Over 50% of the patients had infections due to organisms other than Escherichia coli, including Pseudomonas aeruginosa (14), Klebsiella pneumoniae (5), Enterobacter spp (3) and Group D streptococcus (6). Clinical and bacteriologic cure rates were 90 and 91%, respectively. Side effects occurred in 5 patients and were generally mild.

Administration, Oral↗

PubMed1986

DRGs and outpatient antibiotics.

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Anti-Bacterial Agents↗

PubMed1985

Imipenem/cilastatin: general experience in a community hospital.

Imipenem/cilastatin is a new carbapenem antibiotic with broad spectrum antimicrobial activity. Forty two patients with infections of various types, including skin and soft tissue, respiratory tract, bone and joint, and urinary tract, were treated with this antibiotic in an open noncomparative study. Clinical responses to therapy were excellent and failures were only encountered with infections caused by Pseudomonas aeruginosa strains that developed resistance during therapy. Superinfection rates were minimal as were toxicities. Imipenem/cilastatin appears to be a relatively safe and highly effective broad spectrum antibiotic.

Adult↗

PubMed1985

An overview of cefotaxime therapy in infections caused by gram-positive pathogens.

The in vitro activity of cefotaxime and other third-generation cephalosporins against gram-positive pathogens is generally considered to be less than that of earlier cephalosporins, such as cefazolin. A review of pooled pre-release data collected by numerous investigators and supplied by Hoechst-Roussel made it possible to evaluate the clinical and bacteriologic efficacy of cefotaxime in more than 900 infections caused by gram-positive organisms. The most commonly isolated pre-treatment organisms were Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae, and other streptococcal species. The overall clinical efficacy rate was 95% and the bacteriologic eradication rate was 94.5%. Side-effects were limited to rash in two, diarrhea in one and fever in one. Pain at the administration site was reported by four patients. Comparative studies with cefazolin against S. aureus showed no statistically significant differences in efficacy. The highest failure rates were seen in enterococcal urinary tract infections, as predicted by in vitro sensitivity tests. Cefotaxime appears to be a safe, effective antibiotic for the therapy of infections caused by gram-positive pathogens.

Adolescent↗

PubMed1983

Toxinogenic vaginal infections due to Staphylococcus aureus in menstruating rhesus monkeys without toxic-shock syndrome.

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Animals↗

PubMed1983

Susceptibility of the Bacteroides fragilis group in the United States in 1981.

The minimal inhibitory concentrations of nine antimicrobial agents was determined for over 750 clinical isolates of the Bacteroides fragilis group of anaerobic bacteria collected from nine centers in the United States during 1981. High resistance rates were documented for cefoperazone, cefotaxime, and tetracycline. Cefoxitin had the best activity of the beta-lactam antibiotics, whereas moxalactam and piperacillin had good activities. The resistance rate for clindamycin was 6%. There were no metronidazole- or chloramphenicol-resistant isolates encountered. There were significant differences in susceptibility among the various species of the B. fragilis group, particularly with moxalactam, cefoxitin, and clindamycin. Clustering of clindamycin-, piperacillin-, and cefoxitin-resistant isolates was observed at different hospitals. The variability of resistance rates with the beta-lactam antibiotics and clindamycin indicates that susceptibility testing of significant clinical isolates should be performed to define local resistance patterns.

Anti-Bacterial Agents↗

PubMed1982