Improved eradication of Clostridium difficile spores from toilets of hospitalized patients using an accelerated hydrogen peroxide as the cleaning agent.

Background: C. difficle spores in the environment of patients with C. difficile associated disease (CDAD) are difficult to eliminate.

Real-time PCR assay provides reliable assessment of intrapartum carriage of group B Streptococcus.

The objective of this study was to determine the reliability of the real-time PCR assay for determining the group B Streptococcus (GBS) status of women in labor. In this prospective study we compared the results of culture and PCR testing of vaginal and rectal samples collected by nursing staff when women were in labor. Patients' charts were also reviewed to obtain relevant information about pregnancy risk factors.

Reductions in workload and reporting time by use of methicillin-resistant Staphylococcus aureus screening with MRSASelect medium compared to mannitol-salt medium supplemented with oxacillin.

Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen in both nosocomial and community settings, and screening for carriers is an important infection control practice in many hospitals. In this retrospective study, we demonstrate that the implementation of an MRSA screening protocol using a selective chromogenic medium (MRSASelect) reduced the workload for this screening test by 63.7% overall and by 12.

Antibiotic resistance in outpatient urinary isolates: final results from the North American Urinary Tract Infection Collaborative Alliance (NAUTICA).

The goal of the North American Urinary Tract Infection Collaborative Alliance (NAUTICA) study was to determine antibiotic susceptibility to commonly used agents for urinary tract infections against outpatient urinary isolates obtained in various geographic regions in the USA and Canada. Forty-one medical centres (30 from the USA and 11 from Canada) participated, with each centre submitting up to 50 consecutive outpatient midstream urine isolates. Isolates were identified to species level by the standard protocol of each laboratory.

Antibiotic combinations significantly more active than monotherapy in an in vitro infection model of Stenotrophomonas maltophilia.

The goal of this study was to investigate clinical doses of trimethoprim-sulfamethoxazole (TMP-SMX) alone and in combination against Stenotrophomonas maltophilia in an in vitro pharmacodynamic infection model. A 1-compartment model was established using 4 clinical isolates of S. maltophilia susceptible to TMP-SMX and susceptible or intermediately susceptible to at least one other agent (ie, ceftazidime, ciprofloxacin, gentamicin, tobramycin).

Pharmacokinetics and pharmacodynamics of meropenem in febrile neutropenic patients with bacteremia.

Background: Pharmacodynamic investigations with antimicrobials define the relationship between the infecting organism and achievable drug concentrations with clinical outcome.

Objective: To examine this relationship for meropenem in a population of patients who are at high risk of infection-related morbidity and mortality.

Methods: The study was a retrospective analysis of a multicenter, randomized, blinded clinical trial.

Predictors of receipt of a fluoroquinolone versus trimethoprim-sulfamethoxazole for treatment of acute pyelonephritis in women in Manitoba, Canada.

Purpose: The increasing and comparatively high proportion of uropathogens in Canada resistant to trimethoprim-sulfamethoxazole (TMP-SMX) may be partially responsible for the increasing use of fluoroquinolones. A number of patient-specific variables have been identified as risk factors for infections caused by antibiotic-resistant pathogens. However, variables unrelated to need, have also been associated with receipt of broad-spectrum antibiotics.

Effect of antibiotic sequence on combination regimens against Pseudomonas aeruginosa in a multiple-dose, in vitro infection model.

The goal of this study was to investigate the effect of antibiotic sequence on combination regimens against Pseudomonas aeruginosa in an in vitro infection model. Ceftazidime plus ciprofloxacin and ceftazidime plus tobramycin were dosed every 12 h for 48 h using simultaneous or staggered administration. Simultaneous dosing and ceftazidime followed by ciprofloxacin or tobramycin were significantly more active at both 24 h (p = 0.

Peritoneal fluid titer test for peritoneal dialysis-related peritonitis.

Standard microbiological tests (i.e., MIC) do not account for the unique factors of peritoneal dialysis (PD)-related peritonitis which can significantly influence treatment response.

Treatment and outcome of Pseudomonas aeruginosa bacteraemia: an antibiotic pharmacodynamic analysis.

Objectives: To conduct a retrospective study of antibiotic pharmacodynamics in the treatment of Pseudomonas aeruginosa bacteraemia, and to identify pharmacodynamic indices associated with clinical cure.

Methods: Cases of P. aeruginosa bacteraemia were identified, and information related to patient demographics, clinical status, antibiotic treatment and clinical outcome were documented.

AUC(0-t)/MIC is a continuous index of fluoroquinolone exposure and predictive of antibacterial response for Streptococcus pneumoniae in an in vitro infection model.

Objective: To conduct a comprehensive pharmacodynamic analysis of moxifloxacin and levofloxacin against Streptococcus pneumoniae in an in vitro infection model.

Methods: In dose escalation studies, single doses with peak concentrations equivalent to 1 x, 2 x, 4 x, 8 x, 16 x and 32 x MIC against two isolates of S. pneumoniae were studied over 24 h.

Antimicrobial treatment in diabetic women with asymptomatic bacteriuria.

Background: Asymptomatic bacteriuria is common among women with diabetes, and the treatment of such infections has been recommended to prevent complications related to symptomatic urinary tract infection.

Methods: We enrolled women (>16 years of age) with diabetes, bacteriuria (> or =105 colony-forming units of an organism per milliliter in cultures of two consecutive urine specimens), and no urinary symptoms; 50 were randomly assigned to receive placebo and 55 to receive antimicrobial therapy. For the first six weeks, which included the initial course of treatment, the study was placebo-controlled and double-blind.

Challenging the current treatment paradigm for methicillin-resistant Staphylococcus epidermidis peritonitis in peritoneal dialysis patients.

Objectives: To analyze clinical outcomes of Staphylococcus epidermidis peritoneal dialysis peritonitis before and after an interventional switch from a vancomycin/ tobramycin to a cefazolin/tobramycin regimen for empiric treatment. To examine risk factors associated with clinical failure.

Design: A retrospective study.

Antibiotic pharmacodynamics in surgical prophylaxis: an association between intraoperative antibiotic concentrations and efficacy.

The objective of this study was to characterize the relationship between gentamicin concentrations during surgery and the development of wound infection following colorectal operations. Despite decades of research in surgical prophylaxis, the relationship between intraoperative antibiotic concentrations and postoperative infection and the concentrations required for effective prophylaxis have not been established. A pharmacodynamic analysis was conducted using data from a previous prospective, randomized, double-blind clinical study which compared two dosage regimens of gentamicin plus metronidazole for prophylaxis in connection with elective colorectal surgery.

An outbreak of necrotizing enterocolitis associated with a novel clostridium species in a neonatal intensive care unit.

An outbreak of necrotizing enterocolitis (NEC) occurred in 6 neonates within a 2-month period. Blood cultures from 3 of these neonates grew the same strain of what appears to be a novel clostridial species for which the name "Clostridium neonatale" has been proposed. A point-prevalence survey that used rectal swabs was performed in our intensive-care and intermediate-care nurseries, and it indicated that 20.

Activities of new fluoroquinolones, ketolides, and other antimicrobials against blood culture isolates of viridans group streptococci from across Canada, 2000.

The rates of nonsusceptibility to penicillin, erythromycin, and clindamycin of 191 blood culture isolates of viridans group streptococci collected from across Canada in 2000 were 36, 42, and 10%, respectively. Although 8% of the strains were resistant to ciprofloxacin (MIC >or= 4 microg/ml), the MICs of gemifloxacin, BMS 284756, telithromycin, and ABT 773 at which 90% of the strains were inhibited were 0.06, 0.