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Biomedical subjects

G S Hall

Publications and source records attributed to G S Hall.

At least 19 recordsLinked to original sources
PubMed2006

Use of partial 16S rRNA gene sequencing for identification of Legionella pneumophila and non-pneumophila Legionella spp.

We examined 49 Legionella species, 26 L. pneumophila and 23 non-pneumophila Legionella spp., using partial 16S rRNA gene sequencing. This approach accurately identified all the L. pneumophila isolates, characterized all non-pneumophila Legionella isolates as such within this genus, and classified most (20/23; 87%) of the non-pneumophila Legionella isolates to the species level.

Bacterial Typing Techniques↗
PubMed2005

Multicenter evaluation of a Candida albicans peptide nucleic acid fluorescent in situ hybridization probe for characterization of yeast isolates from blood cultures.

We evaluated aliquots from 244 clinical blood culture bottles that demonstrated yeasts on Gram stain using a Candida albicans peptide nucleic acid (PNA) fluorescent in situ hybridization (FISH) probe. The sensitivity, specificity, positive predictive value, and negative predictive value of the C. albicans PNA FISH test in this study were 99%, 100%, 100%, and 99.3%, respectively.

Blood↗
PubMed2001

Mastitis due to Mycobacterium abscessus after body piercing.

We describe a patient with granulomatous mastitis due to Mycobacterium abscessus that presented as a mass lesion and was associated with a pierced nipple. To our knowledge, this is the first reported case of mastitis due to M. abscessus and the first association of this organism with body piercing.

Adolescent↗
PubMed2001

Relapsing Exophiala jeanselmei phaeohyphomycosis in a lung-transplant patient.

Dematiaceous fungi are a cause of a variety of human infections, including phaeohyphomycosis, that may affect patients with solid organ or bone marrow transplants. Exophiala jeanselmei, the most common cause of the pheomycotic cyst/subcutaneous phaeohyphomycosis in the United States, has been shown to cause disease in transplant recipients. We report a lung-transplant patient with relapsing and invasive E. jeanselmei phaeohyphomycosis, who previously had a pheomycotic cyst excised and treated with oral fluconazole. The patient was subsequently treated with re-excision and an 8-month course of oral itraconazole without relapse as to date.

Adult↗
PubMed2001

Evaluation of ColorPAC Giardia/Cryptosporidium rapid assay and ProSpecT Giardia/Cryptosporidium microplate assay for detection of Giardia and Cryptosporidium in fecal specimens.

Detection of Giardia and Cryptosporidium in clinical stool specimens using the ColorPAC and ProSpecT enzyme immunoassays revealed 98.7% agreement for Giardia detection and 98.1% agreement for Cryptosporidium detection. Sensitivities were uniformly 100%. The specificities of the ColorPAC immunoassay for Giardia and Cryptosporidium detection were 100 and 99.5%, respectively, and those for the ProSpecT assay were 98.4 and 98.6%, respectively. The false-positive reactions with the ProSpecT assay occurred with specimens that were grossly bloody.

Animals↗
PubMed2001

Case of synovitis potentially caused by Dolosigranulum pigrum.

We report a case of synovitis in a 64-year-old man who developed the infection while on steroid therapy for rheumatoid arthritis. Dolosigranulum pigrum, a gram-positive catalase-negative coccus, was isolated from two sets of blood cultures prior to antibiotic therapy. The patient was treated with 4 weeks of appropriate antibiotics, and the synovial inflammation resolved. Although synovial aspirates were never positive for any bacteria or fungi, the timing of positive blood cultures and absence of other pathogens suggest the possible etiology as D. pigrum.

Blood↗
PubMed2001

Handwashing compliance: what works?

UNLABELLED: Health care personnel--particularly physicians--do a poor job of complying with national handwashing guidelines, yet handwashing is the cornerstone of infection control. New products designed to increase compliance are available, such as automated handwashing machines, but their clinical benefits have not been fully studied. The best solution for now may be to continue awareness campaigns and education programs, ensure access to sinks and appropriate antiseptic products, and promote the use of alcohol disinfectants when handwashing is not possible. KEY POINTS: Antiseptic products are now preferred over handwashing with plain soap, which does not reliably prevent transmission of bacteria. Because 100% compliance may not be realistic, interventions that improve compliance, such as the use of alcohol sanitizing products when handwashing is not possible, may be the best solution. A number of barriers deter compliance, including lack of access to handwashing stations and lack of time. Gloves are not a substitute for handwashing because they are not fully protective.

Automation↗
PubMed2001

Histologic features of zygomycosis: emphasis on perineural invasion and fungal morphology.

OBJECTIVE: Invasive zygomycosis is rapidly progressive and is associated with angioinvasion and infarction. Invasive disease requires emergent surgical and medical intervention. Because it is important for surgical pathologists to recognize these fungi and their preferential sites of growth, the objective of this article is to describe the fungal morphology and histopathologic findings in biopsies from patients with zygomycotic disease, with emphasis on preferential sites of fungal growth. DESIGN: Medical record and histologic review identified 20 patients with zygomycosis. Inclusion criteria included the presence of typical ribbonlike hyphae and positive culture, a clinical history of invasive zygomycosis, or both. The histologic features of disease and the fungal morphology were assessed. RESULTS: Fungus ball (15%), rhinocerebral (55%), and pulmonary (30%) disease were the types of disease represented. The inflammatory responses were predominantly neutrophilic (50%), predominantly granulomatous (5%), pyogranulomatous (25%), or absent (20%). Invasive disease was characterized by prominent infarcts (94%), angioinvasion (100%), and, surprisingly, prominent perineural invasion (90%) in biopsies that contained nerves for evaluation. At least rare hyphal septa were always seen (100%), and most branches (95%) varied from 45 degrees to 90 degrees. CONCLUSIONS: As known to mycologists, zygomycetes are pauciseptate, rather than aseptate, molds. Therefore, the presence of an occasional septum is expected. Perineural invasion is a common finding in invasive zygomycosis, as are angioinvasion and infarcts. Therefore, prior to excluding the presence of these fungi in biopsies suspected to contain zygomycetes, the perineural space should be carefully examined.

Aspergillosis↗
PubMed2000

Screening and confirmatory testing for extended spectrum beta-lactamases (ESBL) in Escherichia coli, Klebsiella pneumoniae, and Klebsiella oxytoca clinical isolates.

Escherichia coli and Klebsiella spp. were screened for ESBL based on routine susceptibility testing results. Isolates with intermediate or resistant susceptibilities for extended spectrum cephalosporins or aztreonam were reported as probable ESBL producers. By using the NCCLS proposed ESBL confirmatory method, we tested 61 screen-positive isolates from 42 patients, 30 randomly selected susceptible isolates, and 12 isolates with previously characterized beta-lactamases. Ceftazidime contributed to 97% of screen-positive isolates, whereas aztreonam added a single patient isolate. An ESBL was confirmed in 86% of K. pneumoniae, 100% of K. oxytoca, and 20% of E. coli screen-positive single patient isolates. None of the susceptible isolates were shown to produce ESBL. Based on these findings a comment regarding the presence of ESBL seems sufficient for Klebsiella spp. but confirmatory testing is indicated for E. coli. 0.25 microg/mL was used to indicate the presence of ESBL, the specificity of the assay increased to 100%. The NCCLS ESBL phenotypic confirmatory method was reproducible and accurate enough to be used in the clinical laboratory.

Anti-Bacterial Agents↗
PubMed1999

Risk factors for an outbreak of multi-drug-resistant Acinetobacter nosocomial pneumonia among intubated patients.

INTRODUCTION: Acinetobacter baumanii is a Gram-negative coccobacillus that is normally a commensal pathogen but can be a nosocomial pathogen. An epidemiologic study was performed to investigate an outbreak of A baumanii that occurred in our medical intensive care unit (MICU) from March to September 1995. METHODS: A case-control study was performed by retrospective chart review, comparing case patients to randomly selected patients who were mechanically ventilated in the MICU for at least 1 week during the outbreak. A case patient was defined as any patient with an Acinetobacter infection in which the epidemic strain was considered to be a pathogen. The epidemic strain was defined by its antibiogram. Case patients and control patients were compared for age, gender, underlying disease, acute physiology and chronic health evaluation III score, length of MICU stay, prior antibiotic use, presence of fever, sepsis, type of pulmonary infiltrate, and outcome. Environmental and hand-washing studies also were performed during the period of the outbreak. Molecular typing was performed on available bloodstream isolates. RESULTS: There were 15 cases of A baumanii nosocomial pneumonia. Fifty percent were bacteremic; one chart was unavailable for review. Twenty-nine patients were identified as control patients. The mean age for case patients was 50 (range, 21 to 84). The mean duration of time from admission to the ICU to infection was 12.8 days (range, 4 to 40). Sepsis developed in 35% of the case patients. Forty-three percent of the case patients died during their hospitalization, with two of those deaths attributed to Acinetobacter infection. Univariate analysis showed that prior use of ceftazidime was associated with infection with Acinetobacter (11/14 case patients compared to 11/29 control patients; p < 0.01). Pulsed-field gel electrophoresis revealed two strains to be responsible for the outbreak. Hand washing was performed before patient contact by only 10% of health-care workers, and only 32% washed their hands after patient contact. CONCLUSION: The use of ceftazidime was associated with an increased risk of nosocomial pneumonia with resistant strains of Acinetobacter. Health-care workers need to improve compliance with hand-washing recommendations.

Acinetobacter Infections↗
PubMed1998

Actinomycosis of the cholecystic duct: case report and review.

Actinomycosis of the gall bladder, cholecystic duct or common bile duct is rare, with only 16 cases reported to our knowledge. We report a case of actinomycosis in the cholecystic duct remnant of an 80-year-old woman with a history of cholecystitis, choledocholithiasis and cholecystoduodenal fistula requiring cholecystectomy and fistula closure three years prior. Histologic sections of the cystic duct remnant showed several dense basophilic masses containing numerous, dark blue, Gram-positive branching bacilli compatible with actinomycotic granules. Fluorescent antibody staining was positive for Actinomyces naeslundii. Staining for acid-fast bacilli was negative. The pathogenesis, presentation, diagnosis and management of abdominal actinomycosis with specific reference to disease involving the gall bladder are discussed.

Actinomyces↗
PubMed1998

Routine cultures of bone marrow and peripheral stem cell harvests: clinical impact, cost analysis, and review.

The American Association of Blood Banks requires routine culture of hematopoietic progenitor cells prior to bone marrow transplantation. We sought to evaluate the cost of that requirement and the incidence and clinical significance of positive cultures. We performed a retrospective analysis of transplant recipients at our institution. Of the 605 patients for whom 1,934 consecutive cultures of harvests were done between December 1992 and February 1996, 11 had positive cultures. Six patients received a culture-positive harvest with no adverse effects. The total cost of cultures was $35,660 (U.S. $). In North America and worldwide in 1995, routine culture of harvests would have prevented 7.9 and 18.9 cases of bacteremia, respectively, at a cost of $95,000 per bacteremia prevented. We conclude that routine culture of hematopoietic progenitor cells yields low rates of positivity and that infusion of contaminated harvests rarely results in clinically adverse outcomes.

Adult↗
PubMed1998

Antimicrobial susceptibility testing of a clinical isolate of vancomycin-dependent enterococcus using D-alanine-D-alanine as a growth supplement.

Bacteremia due to a vancomycin-dependent enterococcus (VDE) occurred during long-term vancomycin therapy in a renal transplant recipient with underlying pancreatitis and a vancomycin-resistant enterococcal (VRE) wound infection and bacteremia. The VDE was isolated from blood during vancomycin therapy and grew only in the presence of vancomycin and D-alanine-D-alanine (DADA), a substance required for cell-wall synthesis. Colonies beyond the periphery of growth of the VDE around a vancomycin disk contained vancomycin-independent revertant mutants after 48 hours of incubation. Pulsed-field gel electrophoresis of the VDE, revertant mutant, the initial blood culture isolate of VRE, and an autopsy isolate showed that the four strains were identical. Antimicrobial susceptibility testing was performed using standard macrobroth and microbroth dilution methods. DADA was used as a growth supplement for macrobroth dilution susceptibility testing of the VDE isolate. Minimum inhibitory concentrations (MICs) were similar for the VRE isolate and the VDE revertant, which were both resistant to ampicillin, high-level gentamicin, ciprofloxacin, imipenem, vancomycin, and daptomycin, and were susceptible to fusidic acid, high-level streptomycin, rifampin, and a quinupristin-dalfopristin combination. The MICs of teicoplanin were 2 microg/mL or less and 16 microg/mL for the clinical VRE isolate and the VDE revertant, respectively. The autopsy isolate was resistant to all antimicrobials tested and showed a fourfold increase in MICs for quinupristin-dalfopristin compared with that of the original blood isolate. The VDE was susceptible to all drugs tested except vancomycin.

Alanine↗
PubMed1997

Aspergillus in cytology specimens: a review of 45 specimens from 36 patients.

OBJECTIVE: To assess the clinical significance associated with the identification of fungal elements consistent with Aspergillus in cytology specimens. MATERIALS AND METHODS: For all cytology specimens with reported fungal elements consistent with Aspergillus, reported over a 9 yr and 8 mo period at The Cleveland Clinic Foundation, the patient's medical charts were reviewed with particular attention to underlying disease, presentation, treatment, and clinical course. Cytology results were compared with available microbiologic cultures and tissue specimens in all of the patients. RESULTS: Forty-five cytology specimens with Aspergillus fungal forms, from 36 patients, were identified. Twenty-six patients had concurrent specimens sent for culture in whom II grew Aspergillus species (10 Aspergillus fumigatus), eight grew organisms other than Aspergillus, and seven were no growth. A total of 16 patients (44%) were treated with antifungal treatment (Amphotericin B). Treatment with Amphotericin B was significantly associated with a concurrent growth of Aspergillus species (9/11 patients with Aspergillus culture positive vs. 7/25 patients without a positive culture for Aspergillus, P value = 0.004 (ODDS ratio = 11, 95% confidence interval:#1.6-104, 2-tailed Fisher exact test.) CONCLUSIONS: The presence of fungal forms consistent with Aspergillus in cytology specimens is neither specific nor sensitive for significant infection due to Aspergillus. Treatment with Amphotericin B is more likely to be instituted when a concurrent clinical specimen grows Aspergillus species in culture.

Adult↗
PubMed1997

A comparison of exposures to refractory ceramic fibres over multiple work shifts.

As part of an ongoing, industry-wide study in the manufacture of refractory ceramic fibres (RCF), time weighted average (TWA) exposures have been collected at five facilities according to a standardised protocol. Work activities were grouped into dust zones (DZs). Persons to be sampled were randomly selected according to a protocol designed to assure that at least one sample was collected annually from each DZ; each work shift is also sampled at least annually. TWA exposures calculated over a sampling period of at least 360 min were included in the data set. DZs were combined into one of three groups (DZGs): fibre production; vacuum processes; other. The data were analysed to identify any differences by DZG between airborne fibre exposures, by the shift worked at each facility, and across all facilities. There were no statistically significant shift-related differences detected between airborne fibre exposures across the five RCF facilities when analysed as a group. Within four of the facilities, no shift-related differences were detected between airborne fibre exposures; however, at one facility, first and third shift exposures were statistically different. No documentation related to job activities was found to account for the observation. The data generally support the use of a single exposure estimate for each DZG in each of these facilities, regardless of shift worked. Researchers reconstructing exposure and not able to determine the shift worked by study subjects may find these results useful, but are cautioned that substantial differences in exposure across shifts may exist in other types of manufacturing.

Air Pollutants, Occupational↗