OBJECTIVE To evaluate the antimicrobial susceptibility patterns of Salmonella isolates from feedlot cattle. DESIGN Cross-sectional study. SAMPLE POPULATION 263 Salmonella isolates. PROCEDURES Fecal samples were collected from the floor of 2 pens in each of 100 feedlots. Two hundred eighty Salmonella isolates were recovered after bacteriologic culture from 38 pens. Of these, 263 isolates w...

Members of the Bacteroides fragilis group are among the most common anaerobic bacterial isolates in clinical specimens. Metronidazole, a 5-nitroimidazole, is often used as empirical therapy for anaerobic infections. Susceptibility testing is not routinely performed because of nearly universal susceptibility of Bacteroides spp. to this agent. We report a case of metronidazole-resistant Bacteroid...

Resistance of uropathogenic bacteria to antibiotics is an increasing problem in primary health care. The aim of this study was to evaluate antibacterial susceptibility testing of uropathogenic bacteria when performed in general practice. Urine specimens with a known quantity of typically uropathogenic bacteria were sent to 25 general practices. The predictive values of testing a bacterial strai...

Antifungal susceptibility testing has been in routine use now for more than 15 years and has become a useful tool for clinicians who are faced with difficult treatment decision. Although most clinicians order susceptibility testing, much confusion still exists regarding the use of the results. Sufficient data have been generated to determine susceptibility trends for specific fungi against spec...

Results: The agreement between E-test and BMD at ± 2 dilutions was 82.4%, 83.3% and 82.4% for amphotericin B, itraconazole and voriconazole, respectively. The agreement between SYO and BMD at ± 2 dilutions was 76.5%, 66.7% and 88.2% for amphotericin B, itraconazole and voriconazole, respectively. The majority of differing results are due to higher MICs with the reference method. In particular, ...

Studies were conducted to compare and evaluate antimicrobial susceptibility test results for enterococci obtained by six national committee disk diffusion procedures. Variations in the incidence of isolates in resistance categories and errors were associated with the use of ciprofloxacin, gentamicin, nitrofurantoin, rifampin, and teicoplanin in a number of committee procedures. Results indicate...

FK-037, a new parenteral cephalosporin, was tested against 483 organisms from clinical infections to establish preliminary susceptibility testing criteria with 30-micrograms disks. The proposed breakpoint zone diameters were > or = 17 mm (MIC correlate, < or = 8 micrograms/ml) for the susceptible category and < or = 13 mm (MIC correlate, > or = 32 micrograms/ml) for the resistant category. Thes...

The minimum inhibitory concentration (MIC) of 5-fluorocytosine (5-FC) was determined for 65 isolates of Cryptococcus neoformans by using a twofold serial tube dilution method. The MIC was profoundly influenced by incubation temperature, inoculum size, and duration of incubation. By using a standard set of test conditions, 100% of 49 pretreatment isolates of C. neoformans were susceptible to 10 ...

A broad variety of bacterial strains, including 79 Pseudomonas aeruginosa, were studied in an in vitro evaluation of carbenicillin disk susceptibility testing. Regression analysis with both 50-mug and 100-mug carbenicillin disks was carried out. Organisms having minimal inhibitory concentration values of 100 to 200 mug/ml demonstrated zones of less than 11 mm with the 50-mug disk, resulting in ...