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Nimmo G.R.,Pathology Queensland Central Laboratory | Nimmo G.R.,Griffith University | Bergh H.,Pathology Queensland Central Laboratory | Nakos J.,Pathology Queensland Central Laboratory | And 6 more authors.
Journal of Infection | Year: 2013

Objective: To describe the changing prevalence of healthcare- and community-associated MRSA. Methods: Susceptibility phenotypes of MRSA were observed from 2000 to 2012 using routine susceptibility data. Phenotypic definitions of major clones were validated by genotyping isolates from a nested period prevalence survey in 2011. Results: The predominant healthcare-associated (AUS-2/3 like) MRSA phenotype decreased from 42 to 14 isolates per million occasions of service in outpatients (P<0.0001) and from 650 to 75 isolates per million accrued patient days in inpatients (P 0.0005), while the respective rates of the healthcare-related EMRSA-15 like phenotype increased from 1 to 19 in outpatients (P<0.0001) and from 11 to 83 in inpatients (P<0.0001) and those of the community-associated MRSA phenotype increased from 17 to 296 in outpatients (P<0.0001) and from 71 to 486 in inpatients (P<0.0001). When compared with single nucleotide polymorphism genotyping the AUS-2/3 like phenotype had a sensitivity and positive predictive value (PPV) for CC239 of 1 and 0.791 respectively, while the EMRSA-15 like phenotype had a sensitivity and PPV for CC22 of 0.903 and 0.774. PVL-positive CA-MRSA, predominantly ST93 and CC30, accounted for 60.8% of MRSA, while PVL-negative CA-MRSA, mainly CC5 and CC1, accounted for 21.4%. Conclusions: The initially dominant healthcare-associated MRSA clone has been progressively replaced, mainly by four community-associated lineages. © 2013. Source


Watchirs Smith L.A.,University of New South Wales | Hillman R.,University of Sydney | Ward J.,University of New South Wales | Whiley D.M.,Queensland Paediatric Infectious Diseases Laboratory | And 6 more authors.
Sexually Transmitted Infections | Year: 2013

Objectives: Systematic review of the performance and operational characteristics of point-of-care (POC) tests for the diagnosis of Neisseria gonorrhoeae. Methods: We searched PubMed and Embase until August 2010 using variations of the terms: 'rapid test', 'Neisseria gonorrhoeae' and 'evaluation'. Results: We identified 100 papers, 14 studies were included; nine evaluated leucocyte esterase (LE) dipsticks and three immunochromatographic strips, and two clinical audits of microscopy were identified. Of the field evaluations the gold standard was nucleic acid amplification technology in six studies and bacterial culture in the other six. In four studies, 50% or more of the patients were symptomatic. The median sensitivity of LE dipsticks was 71% (range 23 -85%), median specificity was 70% (33-99%), median positive predictive value (PPV) was 19% (5-40%) and median negative predictive value (NPV) was 95% (56-99%). One LE study found a sensitivity of 23% overall, increasing to 75% in symptomatic women. LE dipsticks mostly involved three steps and took under 2 min. The median sensitivity of immunochromatographic tests (ICT) was 70% (60-94%), median speci ficity was 96% (89-97%), median PPV was 56% (55-97%) and median NPV was 93% (92-99%). Immunochromatic strips involved five to seven steps and took 15-30 min. Specificity of microscopy ranged from 38% to 89%. Conclusions: ICT and LE tests had similar sensitivities, but sensitivity results may be overestimated as largely symptomatic patients were included in some studies. ICT had a higher specificity in women than LE tests. The findings highlight the need for improved POC tests for diagnosis of N gonorrhoeae and more standardised evaluations. Source


Mitchell M.,Melbourne Sexual Health Center | Rane V.,Melbourne Sexual Health Center | Fairley C.K.,Melbourne Sexual Health Center | Fairley C.K.,University of Melbourne | And 8 more authors.
Sexually Transmitted Infections | Year: 2013

Background Culture is insensitive for the detection of pharyngeal gonorrhoea but isolation is pivotal to antimicrobial resistance surveillance. The aim of this study was to ascertain whether recommendations provided to clinicians (doctors and nurses) on pharyngeal swabbing technique could improve gonorrhoea detection rates and to determine which aspects of swabbing technique are important for optimal isolation. Methods This study was undertaken at the Melbourne Sexual Health Centre, Australia. Detection rates among clinicians for pharyngeal gonorrhoea were compared before ( June 2006-May 2009) and after ( June 2009-June 2012) recommendations on swabbing technique were provided. Associations between detection rates and reported swabbing technique obtained via a clinician questionnaire were examined. Results The overall yield from testing before and after provision of the recommendations among 28 clinicians was 1.6% (134/8586) and 1.8% (264/15 046) respectively ( p=0.17). Significantly higher detection rates were seen following the recommendations among clinicians who reported a change in their swabbing technique in response to the recommendations (2.1% vs 1.5%; p=0.004), swabbing a larger surface area (2.0% vs 1.5%; p=0.02), applying more swab pressure (2.5% vs 1.5%; p<0.001) and a change in the anatomical sites they swabbed (2.2% vs 1.5%; p=0.002). The predominant change in sites swabbed was an increase in swabbing of the oropharynx: from a median of 0% to 80% of the time. Conclusions More thorough swabbing improves the isolation of pharyngeal gonorrhoea using culture. Clinicians should receive training to ensure swabbing is performed with sufficient pressure and that it covers an adequate area that includes the oropharynx. Source


Lahra M.M.,Neisseria Reference Laboratory and Collaborating Center for WPR and SEAR | Lahra M.M.,University of New South Wales | Lo Y.-R.,WHO Regional Office for the Western Pacific | Whiley D.M.,Queensland Paediatric Infectious Diseases Laboratory | Whiley D.M.,University of Queensland
Sexually Transmitted Infections | Year: 2013

Objective To outline the current situation of gonococcal antimicrobial resistance (AMR) in the Western Pacific region and factors that impact on this. Background The Western Pacific region is densely populated with many living in poverty. There are high rates of infectious diseases, and a disproportionate burden of gonococcal disease. In many countries there is uncontrolled antimicrobial use: these are ideal conditions for the emergence of AMR. Methods Gonococcal AMR in this region has been monitored for more than 20 years. Clinical isolates, predominantly from unselected patients attending sexually transmitted diseases clinics, are tested against a panel of antibiotics. Quality assurance and control strategies are in place. Results There is widespread, high level resistance to penicillin and ciprofloxacin. Decreased susceptibility to ceftriaxone (MIC=0.06 mg/L) is reported in high levels from some countries in the region. Low numbers of isolates tested in some countries reflect capacity for testing, and are suboptimal for surveillance. Conclusion The raised MIC values to ceftriaxone, and the emergence and spread of ceftriaxone resistant strains regionally is alarming. Sustaining and enhancing surveillance is critical; however obtaining an adequate sample size is a long-standing issue. The implementation of molecular surveillance strategies could provide broader information on the spread and threat of AMR. Source


Kapur N.,Woolworths Building | Mackay I.M.,Queensland Paediatric Infectious Diseases Laboratory | Sloots T.P.,Queensland Paediatric Infectious Diseases Laboratory | Masters I.B.,Woolworths Building | Chang A.B.,Woolworths Building
Archives of Disease in Childhood | Year: 2014

Background: Respiratory viral infections precipitate exacerbations of chronic respiratory diseases such as asthma and chronic obstructive pulmonary disease though similar data in non-cystic fibrosis (CF) bronchiectasis are missing. Our study aimed to determine the point prevalence of viruses associated with exacerbations and evaluate clinical and investigational differences between virus-positive and -negative exacerbations in children with bronchiectasis. Methods: A cohort of 69 children (median age 7 years) with non-CF bronchiectasis was prospectively followed for 900 child-months. PCR for 16 respiratory viruses was performed on nasopharyngeal aspirates collected during 77 paediatric pulmonologist-defined exacerbations. Clinical data, systemic (C reactive protein (CRP), IL-6, procalcitonin, amyloid-A, fibrinogen) and lung function parameters were also collected. Findings: Respiratory viruses were detected during 37 (48%) exacerbations: human rhinovirus (HRV) in 20; an enterovirus or bocavirus in four each; adenoviruses, metapneumovirus, influenza A virus, respiratory syncytial virus, parainfluenza virus 3 or 4 in two each; coronavirus or parainfluenza virus 1 and 2 in one each. Viral codetections occurred in 6 (8%) exacerbations. HRV-As (n=9) were more likely to be present than HRV-Cs (n=2). Children with virus-positive exacerbations were more likely to require hospitalisation (59% vs 32.5% (p=0.02)) and have fever (OR 3.1, 95% CI 1.2 to 11.1), hypoxia (OR 25.5, 95% CI 2.0 to 322.6), chest signs (OR 3.3, 95% CI 1.1 to 10.2) and raised CRP (OR 4.7, 95% CI 1.7 to 13.1) when compared with virus-negative exacerbations. Interpretation: Respiratory viruses are commonly detected during pulmonary exacerbations of children with bronchiectasis. HRV-As were the most frequently detected viruses with viral codetection being rare. Time-sequenced cohort studies are needed to determine the role of viral-bacterial interactions in exacerbations of bronchiectasis. Source

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