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1.
J Clin Microbiol ; 61(11): e0087323, 2023 11 21.
Artículo en Inglés | MEDLINE | ID: mdl-37882528

RESUMEN

The rapid pace of name changes of medically important fungi is creating challenges for clinical laboratories and clinicians involved in patient care. We describe two sources of name change which have different drivers, at the species versus the genus level. Some suggestions are made here to reduce the number of name changes. We urge taxonomists to provide diagnostic markers of taxonomic novelties. Given the instability of phylogenetic trees due to variable taxon sampling, we advocate to maintain genera at the largest possible size. Reporting of identified species in complexes or series should where possible comprise both the name of the overarching species and that of the molecular sibling, often cryptic species. Because the use of different names for the same species will be unavoidable for many years to come, an open access online database of the names of all medically important fungi, with proper nomenclatural designation and synonymy, is essential. We further recommend that while taxonomic discovery continues, the adaptation of new name changes by clinical laboratories and clinicians be reviewed routinely by a standing committee for validation and stability over time, with reference to an open access database, wherein reasons for changes are listed in a transparent way.


Asunto(s)
Hongos , Humanos , Filogenia , Bases de Datos Factuales , Hongos/genética
3.
J Antimicrob Chemother ; 74(Suppl 4): iv48-iv54, 2019 08 01.
Artículo en Inglés | MEDLINE | ID: mdl-31505645

RESUMEN

OBJECTIVES: Understanding the epidemiology of invasive Candida infections is essential to patient management decisions and antifungal stewardship practices. This study characterized the species distribution and antifungal susceptibilities of prospectively collected isolates of Candida species causing bloodstream infections (BSIs) in patients admitted to tertiary care hospitals located in 14 cities across 8 of the 10 Canadian provinces between 2011 and 2016. METHODS: Antifungal susceptibility testing was performed by broth microdilution using CLSI methods, breakpoints and epidemiological cut-off values. DNA sequencing of fks loci was performed on all echinocandin-non-susceptible isolates. RESULTS: Candida albicans (49.6%), Candida glabrata (20.8%) and Candida parapsilosis complex (12.0%) were the most common species out of 1882 isolates associated with BSIs. Candida tropicalis (5.2%), Candida krusei (4.3%), Candida dubliniensis (4.1%), Candida lusitaniae (1.4%) and Candida guilliermondii (1.1%) were less frequently isolated. Between 2011 and 2016, the proportion of C. albicans significantly decreased from 60.9% to 42.1% (P < 0.0001) while that of C. glabrata significantly increased from 16.4% to 22.4% (P = 0.023). C. albicans (n = 934), C. glabrata (n = 392) and C. parapsilosis complex (n = 225) exhibited 0.6%, 1.0% and 4.9% resistance to fluconazole and 0.1%, 2.5% and 0% resistance to micafungin, respectively. Mutations in fks hot-spot regions were confirmed in all nine micafungin non-susceptible C. glabrata. CONCLUSIONS: Antifungal resistance in contemporary isolates of Candida causing BSIs in Canada is uncommon. However, the proportion of C. glabrata isolates has increased and echinocandin resistance in this species has emerged. Ongoing surveillance of local hospital epidemiology and appropriate antifungal stewardship practices are necessary to preserve the utility of available antifungal agents.


Asunto(s)
Antifúngicos/farmacología , Candida/efectos de los fármacos , Candidiasis Invasiva/microbiología , Farmacorresistencia Fúngica , Adolescente , Adulto , Anciano , Canadá/epidemiología , Candida/aislamiento & purificación , Candidiasis Invasiva/epidemiología , Niño , Preescolar , Monitoreo Epidemiológico , Femenino , Hospitales , Humanos , Lactante , Recién Nacido , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Adulto Joven
4.
J Antimicrob Chemother ; 74(Suppl 4): iv5-iv21, 2019 08 01.
Artículo en Inglés | MEDLINE | ID: mdl-31505641

RESUMEN

OBJECTIVES: The CANWARD surveillance study was established in 2007 to annually assess the in vitro susceptibilities of a variety of antimicrobial agents against bacterial pathogens isolated from patients receiving care in Canadian hospitals. METHODS: 42 936 pathogens were received and CLSI broth microdilution testing was performed on 37 355 bacterial isolates. Limited patient demographic data submitted with each isolate were collated and analysed. RESULTS: Of the isolates tested, 43.5%, 33.1%, 13.2% and 10.2% were from blood, respiratory, urine and wound specimens, respectively; 29.9%, 24.8%, 19.0%, 18.1% and 8.2% of isolates were from patients in medical wards, emergency rooms, ICUs, hospital clinics and surgical wards. Patient demographics associated with the isolates were: 54.6% male/45.4% female; 13.1% patients aged ≤17 years, 44.3% 18-64 years and 42.7% ≥65 years. The three most common pathogens were Staphylococcus aureus (21.2%, both methicillin-susceptible and MRSA), Escherichia coli (19.6%) and Pseudomonas aeruginosa (9.0%). E. coli were most susceptible to meropenem and tigecycline (99.9%), ertapenem and colistin (99.8%), amikacin (99.7%) and ceftolozane/tazobactam and plazomicin (99.6%). Twenty-three percent of S. aureus were MRSA. MRSA were most susceptible to ceftobiprole, linezolid and telavancin (100%), daptomycin (99.9%), vancomycin (99.8%) and tigecycline (99.2%). P. aeruginosa were most susceptible to ceftolozane/tazobactam (98.3%) and colistin (95.0%). CONCLUSIONS: The CANWARD surveillance study has provided 10 years of reference antimicrobial susceptibility testing data on pathogens commonly causing infections in patients attending Canadian hospitals.


Asunto(s)
Antibacterianos/farmacología , Farmacorresistencia Bacteriana , Infecciones por Escherichia coli/microbiología , Escherichia coli/efectos de los fármacos , Pseudomonas aeruginosa/efectos de los fármacos , Infecciones Estafilocócicas/microbiología , Staphylococcus aureus/efectos de los fármacos , Adolescente , Adulto , Anciano , Canadá/epidemiología , Monitoreo Epidemiológico , Escherichia coli/aislamiento & purificación , Infecciones por Escherichia coli/epidemiología , Femenino , Hospitales , Humanos , Masculino , Pruebas de Sensibilidad Microbiana , Persona de Mediana Edad , Infecciones por Pseudomonas/epidemiología , Infecciones por Pseudomonas/microbiología , Pseudomonas aeruginosa/aislamiento & purificación , Infecciones Estafilocócicas/epidemiología , Staphylococcus aureus/aislamiento & purificación , Adulto Joven
5.
Can J Neurol Sci ; 46(5): 595-598, 2019 09.
Artículo en Inglés | MEDLINE | ID: mdl-31266552

RESUMEN

Creutzfeldt-Jakob disease (CJD) is a fatal neurological illness for which accurate diagnosis is paramount. Real-time quaking-induced conversion (RT-QuIC) is a prion-specific assay with high sensitivity and specificity for CJD. The Canadian endpoint quaking-induced conversion (EP-QuIC) test is similar, but unlike RT-QuIC there is little data regarding its diagnostic utility in clinical practice. In this exploratory predictive value analysis of EP-QuIC in CJD, the negative predictive value (NPV) and positive predictive value (PPV) was 100% and 83%, respectively, with one false-positive result identified. Re-testing this sample with an optimized EP-QuIC protocol eliminated this false-positive result, leading to a PPV of 100%.


La valeur prédictive de la méthode diagnostique dite de conversion provoquée par tremblement au point final dans le cas de la maladie de Creutzfeldt-Jakob. La maladie de Creutzfeldt-Jakob (MCJ) est une maladie neurologique qui entraîne à terme un décès et pour laquelle l'établissement d'un diagnostic précis est primordial. La conversion provoquée par tremblement en temps réel (RT-QuIC en anglais) est une méthode diagnostique qui repose sur la détection de la protéine prion. Dans le cas de la MCJ, cette méthode est réputée posséder une sensibilité et une spécificité élevées. La méthode canadienne dite de conversion provoquée par tremblement au point final (EP-QuIC en anglais) se veut similaire mais, à la différence de la RT-QuIC, il existe peu de données en ce qui concerne son utilité diagnostique dans le cadre d'une pratique clinique. Dans cette analyse prédictive exploratoire de la EP-QuIC en lien avec la MCJ, la valeur prédictive négative (VPN) et la valeur prédictive positive (VPP) ont été respectivement de 100 % et de 83 %, un seul résultat faux-positif ayant été identifié. Le fait de soumettre notre échantillon à un nouveau test effectué à l'aide d'un protocole d'EP-QuIC optimisé a permis d'éliminer ce résultat faux-positif, ce qui a débouché sur une VPP de 100 %.


Asunto(s)
Síndrome de Creutzfeldt-Jakob/diagnóstico , Proteínas PrPSc/análisis , Proteínas Priónicas/análisis , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , Valor Predictivo de las Pruebas
6.
N C Med J ; 80(4): 234-236, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31278186

RESUMEN

Health care is ready for a transformation in how we leverage data, technology, and analytics to improve care. This requires starting off with a focus on establishing trusted data and setting clear paths within organizational cultures to accommodate and empower innovation in health care delivery with better insights from data and analytics.


Asunto(s)
Atención a la Salud , Cultura Organizacional
7.
Int J Equity Health ; 17(1): 78, 2018 06 15.
Artículo en Inglés | MEDLINE | ID: mdl-29903017

RESUMEN

BACKGROUND: Equitable access to primary health care (PHC) is an important component of integrated chronic disease management. Whilst context is known to influence access to PHC, it is poorly researched. The aim of this study was to determine the contextual influences associated with access arrangements in four Australian models of integrated PHC. METHODS: A multi-method comparative case study design. Purposive sampling identified four models of PHC across six sites in two Australian states. Complexity theory informed the choice of contextual factors that influenced access arrangements, which were analysed across five dimensions: availability and accommodation, affordability, acceptability, appropriateness and approachability. Semi-structured interviews, document/website analysis and non-participant observation were used to collect data from clinicians, administrative staff and other key stakeholders. Within and cross-case thematic analysis identified interactions between context and access across sites. RESULTS: Overall, financial viability, objectives of the PHC model and relationships with the local hospital network (LHN) underpinned access arrangements. Local supply of general practitioners and financial viability were strong influences on availability of after-hours services. Influences on affordability were difficult to determine because all models had nil/low out-of-pocket costs for general practitioner services. The biggest influence on acceptability was the goal/objectives of the PHC model. Appropriateness and to a lesser degree affordability arrangements were influenced by the relationship with the LHN. The provision of regular outreach services was strongly influenced by perceived population need, referral networks and model objectives. CONCLUSIONS: These findings provide valuable insights for policy makers charged with improving access arrangements in PHC services. A financially sustainable service underpins attempts to improve access that meets the needs of the service population. Smaller services may lack infrastructure and capacity, suggesting there may be a minimum size for enhancing access. Access arrangements may be facilitated by aligning the objectives between PHC, LHN and other stakeholder models. While some access arrangements are relatively easy to modify, improving resource intensive (e.g. acceptability) access arrangements for vulnerable and/or chronic disease populations will require federal and state policy levers with input from primary health networks and LHNs.


Asunto(s)
Accesibilidad a los Servicios de Salud/organización & administración , Aceptación de la Atención de Salud , Atención Primaria de Salud/organización & administración , Australia , Costos y Análisis de Costo , Humanos
8.
Artículo en Inglés | MEDLINE | ID: mdl-28223374

RESUMEN

Carbapenem-resistant Enterobacter cloacae complex isolates submitted to a reference laboratory from 2010 to 2015 were screened by PCR for seven common carbapenemase gene groups, namely, KPC, NDM, OXA-48, VIM, IMP, GES, and NMC-A/IMI. Nineteen of the submitted isolates (1.7%) were found to harbor Ambler class A blaNMC-A or blaIMI-type carbapenemases. All 19 isolates were resistant to at least one carbapenem but susceptible to aminoglycosides, trimethoprim-sulfamethoxazole, tigecycline, and ciprofloxacin. Most isolates (17/19) gave positive results with the Carba-NP test for phenotypic carbapenemase detection. Isolates were genetically diverse by pulsed-field gel electrophoresis macrorestriction analysis, multilocus sequence typing, and hsp60 gene analysis. The genes were found in various Enterobacter cloacae complex species; however, blaNMC-A was highly associated with Enterobacter ludwigii Whole-genome sequencing and bioinformatics analysis revealed that all NMC-A (n = 10), IMI-1 (n = 5), and IMI-9 (n = 2) producers harbored the carbapenemase gene on EludIMEX-1-like integrative mobile elements (EcloIMEXs) located in the identical chromosomal locus. Two novel genes, blaIMI-5 and blaIMI-6, were harbored on different IncFII-type plasmids. Enterobacter cloacae complex isolates harboring blaNMC-A/IMI-type carbapenemases are relatively rare in Canada. Though mostly found integrated into the chromosome, some variants are located on plasmids that may enhance their mobility potential.


Asunto(s)
Antibacterianos/farmacología , Proteínas Bacterianas/genética , Carbapenémicos/farmacología , Elementos Transponibles de ADN/genética , Enterobacter cloacae/genética , Plásmidos/genética , beta-Lactamasas/genética , Adulto , Anciano , Anciano de 80 o más Años , Técnicas de Tipificación Bacteriana , Canadá , Chaperonina 60/genética , Enterobacter cloacae/efectos de los fármacos , Enterobacter cloacae/aislamiento & purificación , Femenino , Humanos , Masculino , Pruebas de Sensibilidad Microbiana , Persona de Mediana Edad , Tipificación de Secuencias Multilocus , Filogenia , Secuenciación Completa del Genoma
9.
J Clin Microbiol ; 52(5): 1575-81, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24599977

RESUMEN

We describe here the characteristics of Alberta, Canada, patients with infections or colonizations with carbapenemase-producing Gram-negative bacteria during 2010 to 2013 that were linked to recent travel outside Canada. Antimicrobial susceptibility was determined by broth microdilution, and isolates were characterized using PCR, sequencing, and multilocus sequencing typing. A broth mating study was used to assess the transferability of resistance plasmids, which were subsequently characterized. All the patients (n=12) included in our study had contact with a health care system while abroad. Most of the patients presented with urinary tract infections (UTIs) and were admitted to hospitals within weeks after their return to Alberta. Secondary spread occurred in 1 case, resulting in the death of another patient. The carbapenemase-producing bacteria (n=17) consisted of Escherichia coli (sequence type 101 [ST101], ST365, ST405, and ST410) with NDM-1, Klebsiella pneumoniae (ST15, ST16, ST147, ST258, ST340, ST512, and ST972) with NDM-1, OXA-181, KPC-2, and KPC-3, Acinetobacter baumannii with OXA-23, Providencia rettgeri with NDM-1, Enterobacter cloacae with KPC-2, and Citrobacter freundii with NDM-1. The blaNDM-1 gene was associated with various narrow- (i.e., IncF) and broad- (i.e., IncA/C and IncL/M) host-range plasmids with different addiction factors. Our results show that NDM-producing K. pneumoniae, belonging to a variety of sequence types with different plasmid scaffolds, are regularly imported from India into Alberta. Clinical microbiology laboratories should remain vigilant in detecting bacteria with carbapenemases.


Asunto(s)
Proteínas Bacterianas/metabolismo , Bacterias Gramnegativas/genética , Bacterias Gramnegativas/aislamiento & purificación , Infecciones por Bacterias Gramnegativas/microbiología , beta-Lactamasas/metabolismo , Adulto , Anciano de 80 o más Años , Alberta , Antibacterianos/uso terapéutico , Femenino , Bacterias Gramnegativas/efectos de los fármacos , Infecciones por Bacterias Gramnegativas/tratamiento farmacológico , Humanos , India , Masculino , Pruebas de Sensibilidad Microbiana/métodos , Persona de Mediana Edad , Tipificación de Secuencias Multilocus/métodos , Adulto Joven
10.
J Antimicrob Chemother ; 68 Suppl 1: i7-22, 2013 May.
Artículo en Inglés | MEDLINE | ID: mdl-23587781

RESUMEN

OBJECTIVES: The purpose of the CANWARD study was to assess the antimicrobial activity of a variety of available agents against 22,746 pathogens isolated from patients in Canadian hospitals between 2007 and 2011. METHODS: Between 2007 and 2011, 27,123 pathogens were collected from tertiary-care centres from across Canada; 22,746 underwent antimicrobial susceptibility testing using CLSI broth microdilution methods. Patient demographic data were also collected. RESULTS: Of the isolates collected, 45.2%, 29.6%, 14.8% and 10.4% were from blood, respiratory, urine and wound specimens, respectively. Patient demographics were as follows: 54.4%/45.6% male/female, 12.8% ≤ 17 years old, 45.1% 18-64 years old and 42.1% ≥65 years old. Isolates were obtained from patients in medical and surgical wards (37.8%), emergency rooms (25.7%), clinics (18.0%) and intensive care units (18.5%). The three most common pathogens were Escherichia coli (20.1%), Staphylococcus aureus [methicillin-susceptible S. aureus and methicillin-resistant S. aureus (MRSA)] (20.0%) and Pseudomonas aeruginosa (8.0%), which together accounted for nearly half of the isolates obtained. Susceptibility rates (SRs) for E. coli were 100% meropenem, 99.9% tigecycline, 99.7% ertapenem, 97.7% piperacillin/tazobactam, 93.7% ceftriaxone, 90.5% gentamicin, 77.9% ciprofloxacin and 73.4% trimethoprim/sulfamethoxazole. Twenty-three percent of the S. aureus were MRSA. SRs for MRSA were 100% daptomycin, 100% linezolid, 100% telavancin, 99.9% vancomycin, 99.8% tigecycline, 92.2% trimethoprim/sulfamethoxazole and 48.2% clindamycin. SRs for P. aeruginosa were 90.1% amikacin, 93.1% colistin, 84.0% piperacillin/tazobactam, 83.5% ceftazidime, 82.6% meropenem, 72.0% gentamicin and 71.9% ciprofloxacin. CONCLUSIONS: The CANWARD surveillance study has provided important data on the antimicrobial susceptibility of pathogens commonly causing infections in Canadian hospitals.


Asunto(s)
Infección Hospitalaria/microbiología , Pruebas de Sensibilidad Microbiana , Antiinfecciosos/farmacología , Bacterias/clasificación , Bacterias/efectos de los fármacos , Bacterias/aislamiento & purificación , Técnicas de Tipificación Bacteriana , Canadá/epidemiología , Infección Hospitalaria/epidemiología , Infección Hospitalaria/historia , Femenino , Bacterias Gramnegativas/clasificación , Bacterias Gramnegativas/efectos de los fármacos , Bacterias Gramnegativas/aislamiento & purificación , Infecciones por Bacterias Gramnegativas/epidemiología , Infecciones por Bacterias Gramnegativas/microbiología , Historia del Siglo XXI , Humanos , Masculino
12.
J Clin Microbiol ; 50(1): 25-9, 2012 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-22090403

RESUMEN

Clinical cervical cytology specimens (n = 466) collected in PreservCyt (Hologic Inc.) were used to evaluate the agreement between Hybrid Capture 2 (hc2; Qiagen) and cobas 4800 (c4800; Roche Molecular Diagnostics) for the detection of high-risk human papillomavirus (HR HPV) genotype infections. The agreement between the two assays was 93.8% (kappa = 0.87; 95% confidence interval, 0.828 to 0.918), with 186 and 251 concordant positive and negative results, respectively. All 186 concordant positives were confirmed using the Linear Array (LA; Roche Molecular Diagnostics) genotyping test. Of the 29 samples with discordant results (6.2%), 18 were hc2 positive and LA verified 17 as positive for HR HPV. Eleven discordant specimens were c4800 positive, and LA confirmed 5 as positive for HR HPV. As of October 2009, practice guidelines in Alberta, Canada, recommend reflex HPV testing for women over 30 years old with atypical squamous cells of undetermined significance (ASCUS) and for women over 50 years old with low-grade squamous intraepithelial lesions (LSIL) to help prioritize those who should undergo further evaluation. In this study, agreement between hc2 and c4800 results for samples from women over 30 years old with ASCUS cytology was 92.3% (n = 13), while no samples from women over 50 years old with LSIL cytology were identified for analysis.


Asunto(s)
Técnicas de Diagnóstico Molecular/métodos , Papillomaviridae/aislamiento & purificación , Infecciones por Papillomavirus/diagnóstico , Manejo de Especímenes/métodos , Virología/métodos , Adolescente , Adulto , Alberta , Medios de Cultivo/química , ADN Viral/genética , ADN Viral/aislamiento & purificación , Femenino , Genotipo , Humanos , Persona de Mediana Edad , Papillomaviridae/clasificación , Guías de Práctica Clínica como Asunto , Adulto Joven
13.
J Assoc Med Microbiol Infect Dis Can ; 6(3): 221-228, 2021 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-36337753

RESUMEN

We describe the first documented case of meningitis caused by Lodderomyces elongisporus. Identification of L. elongisporus was made on the basis of an arachnoid biopsy with pathology samples sent for fungal internal transcribed spacer sequencing after multiple central nervous system (CNS) fungal culture specimens were negative. After final diagnosis, treatment was transitioned from amphotericin to fluconazole, which, combined with insertion of lumbar drain followed by a permanent ventriculopleural shunt, resulted in significant clinical improvement. Our report reviews the literature of (1) cases of L. elongisporus, which almost exclusively describe fungemia or endocarditis; (2) CNS infections caused by Candida parapsilosis, an organism with which L. elongisporus was previously conflated; and (3) management of fungal meningitis-associated hydrocephalus.


Les chercheurs décrivent le premier cas répertorié de méningite causée par le Lodderomyces elongisporus. Ils ont dépisté le L. elongisporus après avoir effectué une biopsie de l'arachnoïde et envoyé les prélèvements pathologiques au séquençage de l'espaceur transcrit interne fongique après l'obtention de multiples cultures fongiques négatives. Après le diagnostic définitif, le traitement d'amphotéricine a été remplacé par du fluconazole qui, combiné à l'insertion d'un drain lombaire suivie par l'installation d'une dérivation ventriculopleurale permanente, a favorisé une amélioration clinique évidente. L'analyse bibliographique a permis d'extraire 1) des cas de L. elongisporus, qui ont été observés presque exclusivement dans des cas de fongémie auparavant, 2) des infections du système nerveux central causées par le Candida parapsilosis, un organisme avec lequel le L. elongisporus a déjà été confondu et 3) la prise en charge de l'hydrocéphalie associée à la méningite fongique.

14.
J Clin Microbiol ; 48(2): 479-82, 2010 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-20007389

RESUMEN

The Clinical and Laboratory Standards Institute (CLSI) M38-A2 reference broth microdilution (BMD) method for the antifungal susceptibility testing of filamentous fungi now includes guidelines for testing echinocandin activity using the minimum effective concentration (MEC) as the endpoint measurement. In this study, we compared the caspofungin Etest MIC on RPMI agar and Mueller-Hinton agar (supplemented with glucose and methylene blue [MGM]) to the BMD MEC for 345 clinical Aspergillus isolates, including A. flavus, A. fumigatus, A. nidulans, A. niger, and A. terreus. The essential agreement (+/-1 log(2) dilution) of the Etest on MGM and RPMI agar with the reference BMD MEC was 18 and 26%, respectively. The geometric mean values for BMD MEC and MGM Etest were 0.137 and 0.024 microg/ml, respectively, and the geometric mean values for BMD and RPMI agar were 0.128 and 0.031 microg/ml, respectively. Comparatively, 91% of paired MGM and RPMI Etest results were within 2 log(2) dilutions of each other and consistently produced clearly defined endpoints. In conclusion, the caspofungin Etest MIC, like the BMD MEC, is a reproducible endpoint but is markedly lower than the reference BMD. In anticipation of susceptibility breakpoint assignments, optimization studies will be required to improve the concordance of these two assays so that the potential for underreporting echinocandin resistance in Aspergillus is mitigated.


Asunto(s)
Antifúngicos/farmacología , Aspergilosis/microbiología , Aspergillus/efectos de los fármacos , Equinocandinas/farmacología , Pruebas de Sensibilidad Microbiana/métodos , Aspergillus/aislamiento & purificación , Caspofungina , Medios de Cultivo/química , Humanos , Lipopéptidos , Reproducibilidad de los Resultados
15.
J Clin Microbiol ; 47(3): 566-8, 2009 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-19144795

RESUMEN

An incubation time of 24 h at 35 to 38 degrees C is recommended for the optimal performance of MRSASelect (Bio-Rad) chromogenic screening agar. An additional 24 h is required to capture slow-growing methicillin-resistant Staphylococcus aureus (MRSA). However, the normal hours of operation for most laboratories cannot reliably accommodate 24-h interpretation intervals. Daily agar plate interpretations are more likely to occur around 18 h and 42 h of incubation, which may compromise the performance of the chromogenic agar and negatively impact patient infection control efforts. In order to validate the importance of stringent incubation times to plate performance, we evaluated MRSASelect medium at controlled intervals of 24 and 48 h of incubation, using clinical MRSA-screening swabs. A total of 1,071 MRSA-positive and 2,733 MRSA-negative cultures were selected for analysis. Compared to 48-h-incubation results, the sensitivity and specificity of MRSASelect at 24 h were 98.3% and 98.2%, respectively. Only 19 of 1,071 (1.8%) MRSA-positive isolates required 48 h for detection. Holding 24-h negative plates an additional 24 h resulted in the workup of 253 (6.6%) pink, yet non-MRSA, colonies. The 24-h positive and negative predictive values of MRSASelect, assuming MRSA prevalences of 1, 5, and 10%, were 35.5 and 99.98%, 74.2 and 99.9%, and 85.9 and 99.8%, respectively. MRSASelect medium held for 24-h incubation is a highly sensitive and specific MRSA-screening tool. Further incubation prolongs the turnaround time for results and creates a significant amount of unnecessary work in the laboratory.


Asunto(s)
Medios de Cultivo , Resistencia a la Meticilina , Staphylococcus aureus Resistente a Meticilina/crecimiento & desarrollo , Staphylococcus aureus Resistente a Meticilina/aislamiento & purificación , Pruebas de Sensibilidad Microbiana/métodos , Adulto , Hospitales Pediátricos , Humanos , Unidades de Cuidados Intensivos , Tamizaje Masivo/métodos , Valor Predictivo de las Pruebas , Sensibilidad y Especificidad , Temperatura , Factores de Tiempo
16.
BMJ Open ; 8(4): e020552, 2018 04 10.
Artículo en Inglés | MEDLINE | ID: mdl-29643162

RESUMEN

OBJECTIVES: To identify the success attributions of high-performing Australian general practices and the enablers and barriers they envisage for practices wishing to emulate them. DESIGN: Qualitative study using semi-structured interviews and content analysis of the data. Responses were recorded, transcribed verbatim and coded according to success characteristics of high-performing clinical microsystems. SETTING: Primary healthcare with the participating general practices representing all Australian states and territories, and representing metropolitan and rural locations. PARTICIPANTS: Twenty-two general practices identified as high performing via a number of success criteria. The 52 participants were 19 general practitioners, 18 practice managers and 15 practice nurses. RESULTS: Participants most frequently attributed success to the interdependence of the team members, patient-focused care and leadership of the practice. They most often signalled practice leadership, team interdependence and staff focus as enablers that other organisations would need to emulate their success. They most frequently identified barriers that might be encountered in the form of potential deficits or limitations in practice leadership, staff focus and mesosystem support. CONCLUSIONS: Practice leaders need to empower their teams to take action through providing inclusive leadership that facilitates team interdependence. Mesosystem support for quality improvement in general practice should focus on enabling this leadership and team building, thereby ensuring improvement efforts are converted into effective healthcare provision.


Asunto(s)
Medicina General , Liderazgo , Investigación Cualitativa , Australia , Medicina General/normas , Humanos , Atención Primaria de Salud
17.
Diagn Microbiol Infect Dis ; 84(3): 240-5, 2016 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26707068

RESUMEN

Limited data are available that verify the performance of commercial susceptibility methods for Streptococcus pneumoniae following the 2008 Clinical and Laboratory Standards Institute revision of the ß-lactam breakpoints. We compared the performance of Etest, M.I.C. Evaluator (M.I.C.E), Vitek, and Sensititre systems to broth microdilution for S. pneumoniae susceptibility testing of penicillin, ceftriaxone, meropenem, and amoxicillin. Essential agreement was ≥90% for the majority of the ß-lactams and methods tested, particularly for penicillin and ceftriaxone. Categorical agreements (CAs) for penicillin using meningeal and nonmeningeal breakpoints were ≥90%; CAs using penicillin oral breakpoints were 84-89%. Ceftriaxone CAs using nonmeningeal and meningeal breakpoints were 68-88% for Etest, M.I.C.E., and Vitek2 with 6-12% very major errors (VMEs) using meningeal breakpoints. Sensititre CAs for ceftriaxone, amoxicillin, and meropenem were ≥90% with no VMEs. In the context of the current guidelines, there exists considerable method-dependent variability in the susceptibility of S. pneumoniae to ß-lactams.


Asunto(s)
Antibacterianos/farmacología , Pruebas de Sensibilidad Microbiana/métodos , Juego de Reactivos para Diagnóstico , Streptococcus pneumoniae/efectos de los fármacos , beta-Lactamas/farmacología , Humanos , Pruebas de Sensibilidad Microbiana/normas , Infecciones Neumocócicas/diagnóstico , Infecciones Neumocócicas/microbiología , Juego de Reactivos para Diagnóstico/normas , Reproducibilidad de los Resultados , Resistencia betalactámica
18.
Microb Drug Resist ; 21(3): 253-60, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-25545311

RESUMEN

The usefulness of carbapenems for gram-negative infections is becoming compromised by organisms harboring carbapenemases, enzymes which can hydrolyze the drug. Currently KPC (class A), NDM (class B), and OXA-48 types (class D) are the most globally widespread carbapenemases. However, among the GES-type class A extended-spectrum ß-lactamases (ESBLs) there are variants that hydrolyze carbapenems, with blaGES-5 being the most common. Two Escherichia coli and two Serratia marcescens harboring blaGES-5 on plasmids were isolated by the Canadian Nosocomial Infection Surveillance Program (CNISP) from four different patients in a single hospital over a 2-year period. Complete sequencing of the blaGES-5 plasmids indicated that all four had nearly identical backbones consisting of genes for replication, partitioning, and stability, but contained variant accessory regions consisting of mobile elements and antimicrobial resistance genes. The plasmids were of a novel replicon type, but belonged to the MOBQ1 group based on relaxase sequences, and appeared to be mobilizable, but not self-transmissible. Considering the time periods of bacterial isolation, it would appear the blaGES-5 plasmid has persisted in an environmental niche for at least 2 years in the hospital. This has implications for infection control and clinical care when it is transferred to clinically relevant gram-negative organisms.


Asunto(s)
Farmacorresistencia Bacteriana/genética , Escherichia coli/genética , Regulación Bacteriana de la Expresión Génica , Genoma Bacteriano , Plásmidos/metabolismo , Serratia marcescens/genética , beta-Lactamasas/genética , Anciano , Anciano de 80 o más Años , Secuencia de Aminoácidos , Antibacterianos/farmacología , Proteínas Bacterianas/genética , Proteínas Bacterianas/metabolismo , Canadá/epidemiología , Carbapenémicos/farmacología , Infección Hospitalaria/tratamiento farmacológico , Infección Hospitalaria/epidemiología , Infección Hospitalaria/microbiología , Endodesoxirribonucleasas/genética , Endodesoxirribonucleasas/metabolismo , Escherichia coli/clasificación , Escherichia coli/enzimología , Escherichia coli/aislamiento & purificación , Infecciones por Escherichia coli/tratamiento farmacológico , Infecciones por Escherichia coli/epidemiología , Infecciones por Escherichia coli/microbiología , Femenino , Hospitales , Humanos , Secuencias Repetitivas Esparcidas , Masculino , Persona de Mediana Edad , Datos de Secuencia Molecular , Filogenia , Plásmidos/química , Replicón , Alineación de Secuencia , Análisis de Secuencia de ADN , Infecciones por Serratia/tratamiento farmacológico , Infecciones por Serratia/epidemiología , Infecciones por Serratia/microbiología , Serratia marcescens/clasificación , Serratia marcescens/enzimología , Serratia marcescens/aislamiento & purificación , beta-Lactamasas/metabolismo
19.
J Pediatr Ophthalmol Strabismus ; 41(6): 358-60, 2004.
Artículo en Inglés | MEDLINE | ID: mdl-15609521

RESUMEN

We report a congenital neurosensory retinal detachment associated with an optic nerve coloboma with subsequent spontaneous reattachment. This represents the earliest reported case of such a clinical situation. An observation period is recommended for infants with this clinical course to allow for the opportunity of spontaneous reattachment.


Asunto(s)
Coloboma/complicaciones , Nervio Óptico/anomalías , Desprendimiento de Retina/etiología , Desprendimiento de Retina/fisiopatología , Humanos , Recién Nacido , Remisión Espontánea , Desprendimiento de Retina/diagnóstico por imagen , Ultrasonografía
20.
Aust Health Rev ; 27(1): 93-102, 2004.
Artículo en Inglés | MEDLINE | ID: mdl-15362301

RESUMEN

We use our experience as consultants to a regional mental health planning project in South Australia to describe three practical aspects of regional health planning. First, we systematically summarised various data on socio-demographic indicators, health status and health service use along with qualitative opinion about needs and services from consultations with over 200 stakeholders. In addition to these data, we found that attention to two other aspects of planning, circumstance and politics, were of critical importance, particularly if the plan was to be implemented and as a way of turning thinking into action.


Asunto(s)
Servicios de Salud Mental/organización & administración , Evaluación de Necesidades , Política , Regionalización/organización & administración , Servicios de Salud Rural/organización & administración , Participación de la Comunidad , Consultores , Demografía , Consejos de Planificación en Salud/organización & administración , Accesibilidad a los Servicios de Salud , Humanos , Área sin Atención Médica , Servicios de Salud Mental/estadística & datos numéricos , Servicios de Salud Rural/estadística & datos numéricos , Factores Socioeconómicos , Australia del Sur
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