To assess the mycobactericidal efficacy of an agent relatively new to disinfection, ortho-phthalaldehyde (OPA) and to compare the resistances of three Mycobacterium species. Mycobacterium bovis (strain BCG) was compared with Mycobacterium chelonae and Mycobacterium terrae to investigate the feasibility of using either of the latter two species in tuberculocidal testing. M chelonae (a rapid grower) and M terrae (an intermediate grower) both grow faster and are less virulent than M bovis (a slow grower).

The quantitative suspension protocol specified by the Environmental Protection Agency (EPA), the Tuberculocidal Activity Test Method (EPA test), was used throughout this study. Standard suspensions of all three species were prepared in a similar manner. Two suspensions of M bovis, created in different laboratories, were used. These were tested against two concentrations of alkaline glutaraldehyde to provide reference data. Two concentrations of OPA were evaluated against all mycobacterial test suspensions. Four replicates of each organism-disinfectant combination were performed.

Results were assessed by analysis of variance. M terrae was significantly more resistant to 0.05% OPA than either M bovis or M chelonae. At 0.21% OPA, M terrae was slightly more susceptible than one test suspension of M bovis, but not significantly different from the other. M chelonae was significantly less resistant than the other species at both OPA concentrations. At their respective minimum effective concentration, OPA achieved a 6-log10 reduction of M bovis in nearly one sixth the time required by glutaraldehyde (5.5 minutes vs 32 minutes).

These data, along with other recent studies, lend support to the idea that M terrae may be a suitable test organism for use in the tuberculocidal efficacy testing of disinfectants. They also confirm the relatively rapid tuberculocidal activity of OPA.

To evaluate the risk of tuberculosis (TB) transmission to patients potentially exposed to two healthcare providers who worked in outpatient settings for several weeks prior to being diagnosed with acid-fast bacilli smear-positive pulmonary TB.

Potentially exposed patients were notified by letter and television reports of the recommended evaluation for TB infection or disease and availability of free screening at the hospital. Prevalence of infection in the screened patients and the incidence rate of TB over the subsequent 2 years were compared to those of a control group of unexposed outpatients.

An urban inner-city hospital.

1,905 patients with potential exposure to the ill healthcare workers; 487 (25%) presented for evaluation. Controls consisted of 951 unexposed patients.

361 potentially exposed patients had their tuberculin test read; 97 (27%) had a purified protein derivative ≥10 mm. In the comparison group, 148 (25%) of 600 with test readings had a ≥10-mm reaction (risk ratio, 1.18; 95% confidence interval, 0.86-1.60). In multivariate analysis, male gender, non-white race, and older age were significantly associated with a positive tuberculin test; exposure was not. No TB cases were identified during screening. Two years after the exposure, 7 TB cases had been reported to the state registry among 1,905 potentially exposed patients (184 cases/100,000 person-years) versus 4 cases in the comparison group of 951 (210 cases/100,000 person-years).

Evaluation of patients exposed to health-care workers with TB disease in ambulatory settings of an inner-city hospital revealed no evidence of transmission of Mycobacterium tuberculosis due to the exposure.

To determine the proportion of vancomycin orders that are appropriate according to national guidelines and to identify targets for educational messages.

Population-based study of vancomycin use in Oregon during a 3-week period. Survey of pharmacists, prospective flagging of vancomycin orders, and data abstraction from patient charts using standardized forms.

Nonpsychiatric hospitals in Oregon.

Four (6%) of the 66 Oregon hospitals had pharmacy restrictions on initial vancomycin orders. Sixty-four (97%) of the hospitals participated in the study of indications for use; 293 vancomycin orders were reported; 3.8 courses were initiated per 1,000 patient-days. Indications for use were determined for 266 (91%); of these, 159 (60%) were deemed appropriate. Of uses for prophylaxis, empirical treatment of suspected gram-positive infection, and treatment of documented gram-positive infection, 57%, 56%, and 65%, respectively, were appropriate. Of hospitals with <250, 251-475, and >475 licensed beds, 65%, 58%, and 57% of vancomycin orders were appropriate. No single medical specialty accounted for >16% of inappropriate vancomycin use.

Vancomycin was used inappropriately by physicians of many different specialties, in hospitals of all sizes, and in sundry clinical situations. The problem of inappropriate vancomycin use does not lend itself to solution by educational strategies targeted at specific subgroups; restrictions by hospital pharmacies may be required.

To evaluate and compare the risk of long-term central venous catheter (CVC) infection in human immunodeficiency virus (HIV)-infected and cancer patients.

Prospective multicenter cohort study based on active surveillance of long-term CVC manipulations and patient outcome over a 6-month period.

Services of infectious diseases and oncology of 12 university hospitals in Paris, France.

In 1995, all HIV and cancer patients with solid malignancy were included at the time of long-term CVC implantation.

Overall, 31.6% of long-term CVC infections were identified in 32% of 201 HIV and 5% of 255 cancer patients. Most were associated with bacteremia, most commonly coagulase-negative staphylococci. The long-term CVC time-related infection risk was greater in HIV than in cancer patients (3.78 vs 0.39 infections per 1,000 long-term CVC days; P<.001). The independent risk factors of long-term CVC infection were as follows: in HIV patients, frequency of long-term CVC handling and neutropenia; in cancer patients, poor Karnofsky performance status; in both HIV and cancer patients, recent history of bacterial infection. The risk of long-term CVC infection was similar for tunneled catheters and venous access ports in each population.

Prevention of long-term CVC infection should focus first on better sterile precautions while handling long-term CVC, especially in HIV patients who have frequent and daily use of the long-term CVC.

To determine which influenza vaccination program characteristics were associated with high resident vaccination rates in Canadian long-term–care facilities (LTCFs).

A cross-sectional survey consisting of a mailed questionnaire conducted in spring 1991.

All 1,520 Canadian LTCFs for the elderly with at least 25 beds.

The mean overall influenza vaccination rate in the 1,270 (84%) responding facilities was 79%. In multivariate analysis, the variables significantly associated with increased vaccination rates were: a single nonphysician staff person organizing the program, having more program aspects covered by written policies, the offering of vaccine to all residents, a policy of obtaining consent on admission that was durable for future years rather than repeating consent annually, and automatically administering vaccine to residents whose guardians could not be contacted for consent. Any encouragement to staff to be vaccinated had a significant impact on staff vaccination rates.

Well-organized influenza vaccination programs increase the influenza vaccination rates of residents in Canadian LTCFs. Facilities need to develop resident vaccination programs further and to focus on vaccinating staff.