Li D.,University of Victoria |
McKay R.,Center for Disease Control |
Purych D.,BC Biomedical Laboratories Ltd |
Patrick D.M.,Center for Disease Control
British Columbia Medical Journal | Year: 2010
This article highlights recent trends in antimicrobial resistance of key bacterial patho - gens. These findings represent a brief overview of the BCCDC's 2010 Antimicrobial Resistance Trends re - port.1 Bacterial organisms that are monitored for non-susceptibility in the report include methicillin-resistant (MRSA) and methicillin-susceptible (MSSA) Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyogenes, Enterococcus spp., Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Pseudomonas aeruginosa, Salmonella Enteriditis, Haemophilis influenzae, Neisseria meningitides and Neisseria gonorrhoeae.
Mahler M.,INOVA Diagnostics Inc. |
Parker T.,INOVA Diagnostics Inc. |
Peebles C.L.,INOVA Diagnostics Inc. |
Andrade L.E.,Fleury Medicine and Health Laboratory |
And 7 more authors.
Journal of Rheumatology | Year: 2012
Objective. Antinuclear antibodies (ANA) are a serological hallmark of systemic autoimmune rheumatic diseases (SARD) such as systemic lupus erythematosus (SLE). While a number of ANA patterns detected by indirect immunofluorescence (IIF) have diagnostic significance, autoantibodies producing the dense fine speckled (DFS) pattern have been reported to be more prevalent in healthy individuals than in SARD. Methods. Sequential samples submitted for ANA testing were screened for anti-DFS antibodies by IIF (n = 3263). Samples with the DFS pattern were tested for anti-DFS70/lens epithelium-derived growth factor (LEDGF) antibodies by ELISA and by a novel chemiluminescence assay (CIA, Quanta Flash DFS70). Sera from patients with various diseases and healthy individuals were tested for anti-DFS70/LEDGF antibodies by CIA. A cohort of 251 patients with SLE was used to analyze serological and clinical associations of anti-DFS70 antibodies. Results. The frequency of anti-DFS antibodies by IIF was 1.62%. The prevalence of anti-DFS70/LEDGF antibodies as detected by CIA in the different cohorts was 8.9% in healthy individuals, 2.8% in SLE, 2.6% in rheumatoid arthritis, 4.0% in asthma, 5.0% in interstitial cystitis, 1.7% in Graves' disease, and 6.0% in Hashimoto's thyroiditis. Of note, the prevalence of anti-DFS70/LEDGF antibodies was significantly higher in healthy individuals compared to patients with SARD (p = 0.00085). In SLE results, anti-DFS70/LEDGF antibodies were not significantly associated with clinical features or other autoantibodies typically found in SLE. Only 1/7 SLE sera showed anti-DFS70/LEDGF, but no other autoantibody reactivity. Conclusion. "Monospecific" anti-DFS70/LEDGF antibodies may represent a biomarker for differentiating SARD from non-SARD individuals, but there is a need for a reliable assay to ensure reactivity to DFS70. The Journal of Rheumatology Copyright © 2012. All rights reserved.
McKay R.M.,Center for Disease Control |
Vrbova L.,University of British Columbia |
Fuertes E.,University of British Columbia |
Chong M.,Center for Disease Control |
And 13 more authors.
Canadian Journal of Infectious Diseases and Medical Microbiology | Year: 2011
OBJECTIVE: Antibiotic resistance is accelerated by the overuse of antibiotics. Do Bugs Need Drugs? is an educational program adapted in British Columbia to target both the public and health care professionals, with the aim of reducing unnecessary prescribing. The current article presents a descriptive evaluation of the impact of the program over the first four years. METHOD: Program implementation was measured by the amount of educational material distributed and the level of participation in educational sessions. The impact of the program was assessed by measuring changes in knowledge and prescribing habits of participating physicians, and by investigating provincial trends in antibiotic use. RESULTS: A total of 51,367 children, assisted-living residents and health care professionals have participated in the program since its inception in the fall of 2005. Pre- and postcourse assessments of participating physicians indicated significant improvements in clinical knowledge and appropriate antibiotic treatment of upper respiratory tract infections. Overall rates of antibiotic use in the province have stabilized since 2006. The rates of consumption of fluoroquinolones and macrolides have levelled off since 2005. Utilization rates for acute bronchitis are at the same level as when the program was first implemented, but rates for other acute upper respiratory tract infections of interest have declined. CONCLUSIONS: The Do Bugs Need Drugs? program significantly improves physician antibiotic prescription decisions and is ecologically associated with desirable change in population antibiotic consumption patterns. ©2011 Pulsus Group Inc. All rights reserved.
Skowronski D.M.,British Columbia Center for Disease Control |
Skowronski D.M.,University of British Columbia |
Moser F.S.,British Columbia Center for Disease Control |
Janjua N.Z.,British Columbia Center for Disease Control |
And 8 more authors.
PLoS ONE | Year: 2013
Cases of a novel swine-origin influenza A(H3N2) variant (H3N2v) have recently been identified in the US, primarily among children. We estimated potential epidemic attack rates (ARs) based on age-specific estimates of sero-susceptibility and social interactions. A contact network model previously established for the Greater Vancouver Area (GVA), Canada was used to estimate average epidemic (infection) ARs for the emerging H3N2v and comparator viruses (H1N1pdm09 and an extinguished H3N2 seasonal strain) based on typical influenza characteristics, basic reproduction number (R0), and effective contacts taking into account age-specific sero-protection rates (SPRs). SPRs were assessed in sera collected from the GVA in 2009 or earlier (pre-H1N1pdm09) and fall 2010 (post-H1N1pdm09, seasonal A/Brisbane/10/2007(H3N2), and H3N2v) by hemagglutination inhibition (HI) assay. SPR was assigned per convention based on proportion with HI antibody titre ≥40 (SPR40). Recognizing that the HI titre ≥40 was established as the 50%sero-protective threshold we also explored for 1/2SPR40, SPR80 and a blended gradient defined as: 1/4SPR20, 1/2SPR40, 3/4SPR80, SPR160. Base case analysis assumed R0 = 1.40, but we also explored R0 as high as 1.80. With R0 = 1.40 and SPR40, simulated ARs were well aligned with field observations for H1N1pdm09 incidence (AR: 32%), sporadic detections without a third epidemic wave post-H1N1pdm09 (negligible AR<0.1%) as well as A/Brisbane/10/2007(H3N2) seasonal strain extinction and antigenic drift replacement (negligible AR<0.1%). Simulated AR for the novel swine-origin H3N2v was 6%, highest in children 6-11years (16%). However, with modification to SPR thresholds per above, H3N2v AR ≥20% became possible. At SPR40, H3N2v AR ≥10%, ≥15% or ≥30%, occur if R0≥1.48, ≥1.56 or ≥1.86, respectively. Based on conventional assumptions, the novel swine-origin H3N2v does not currently pose a substantial pandemic threat. If H3N2v epidemics do occur, overall community ARs are unlikely to exceed typical seasonal influenza experience. However risk assessment may change with time and depends crucially upon the validation of epidemiological features of influenza, notably the serologic correlate of protection and R0. © 2013 Skowronski et al.
Skowronski D.M.,University of British Columbia |
Hottes T.S.,University of British Columbia |
McElhaney J.E.,University of British Columbia |
McElhaney J.E.,Vancouver Coastal Health Research Institute |
And 11 more authors.
Journal of Infectious Diseases | Year: 2011
Background. Pandemic H1N1 (pH1N1) surveillance data showed lower attack rates but higher risk of severe outcomes with advanced age. We explored immuno-epidemiologic correlates of surveillance findings including humoral and cell-mediated immunity (CMI). Methods. In an age-based design, ∼100 banked/residual sera per 10-year age stratum were assessed by hemagglutination inhibition (HI) and microneutralization (MN) assays for preexisting antibody to pH1N1 and recent seasonal H1N1 and H3N2 strains. In a separate birth cohort design defined by childhood influenza A/subtype priming (1919-1929: H1N1; 1945-1949: H1N1; 1958-1960: H2N2; 1969-1970: H3N2; 1978-1989: H3N2/H1N1), whole blood was collected from up to 50 volunteers per birth cohort. The ratio of Th1(IFN-γ):Th2(IL-10) cytokine responses was evaluated in vitro. Results. Antibody to seasonal viruses was highest in school-age children. Cross-reactive HI/MN antibody to pH1N1 was low among participants <70 years of age (yoa; 6%/4% ≥ 40), but seroprevalence increased at 70-79 yoa (27%/6%), increased even more at 80-89 yoa (65%/47%), and was highest at ≥90 yoa (88%/76%). CMI to pH1N1 was evident in all 5 birth cohorts but was lower compared with seasonal strains. There was little differentiation by subtype priming, but the Th1:Th2 ratio for all viruses dropped significantly in the 2 oldest cohorts. Conclusions. Preexisting antibody may have protected the very old from pH1N1 infection, while diminished CMI may have contributed to greater severity once infected. In the young, cross-reactive pH1N1 antibody was mostly absent, while more intact CMI may have protected against severe outcomes. © The Author 2011. Published by Oxford University Press on behalf of the Infectious Diseases Society of America. All rights reserved.
Ming D.S.,BC Biomedical Laboratories Inc. |
Heathcote J.,BC Biomedical Laboratories Inc.
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2011
A rapid, sensitive, and specific ultra-performance liquid chromatography-tandem mass spectrometry (UPLC/MS/MS) assay method for simultaneous determination of 13 benzodiazepine compounds in human urine was developed and validated. Aliquots of 0.5. mL of urine specimens were used for the analysis and the benzodiazepines were extracted by single step methanol (containing 0.2% formic acid) precipitation and then separated on a BEH C18 (50 mm. ×. 2.1. mm, 1.7. μm) analytical column with the temperature maintained at 45. °C. The mobile phases consisted of methanol and water (both containing 0.2% formic acid) and the flow rate was 0.4. mL/min. The TQ detector, equipped with an electrospray ionization ion source, was set up with a positive mode. The acquisitions were performed in multiple-reaction monitoring (MRM) and the limit of quantification was 20 ng/mL for all of the 13 compounds. The low limits of detections (LODs) of the benzodiazepines in this method were between 0.5 and 2 ng/mL. The chromatographic separation time was 4 min and calibration curves in human urine were generated over the range of 20-2000 ng/mL. The method validation parameters such as accuracy, precision, carryover, recovery, stability, and specificity for all of the 13 compounds were within the acceptable range. This method is suitable for the high throughput screening of benzodiazepines in clinical laboratories. © 2010 Elsevier B.V.
PubMed | BC Biomedical Laboratories Inc.
Type: Journal Article | Journal: Journal of chromatography. B, Analytical technologies in the biomedical and life sciences | Year: 2011
A rapid, sensitive, and specific ultra-performance liquid chromatography-tandem mass spectrometry (UPLC/MS/MS) assay method for simultaneous determination of 13 benzodiazepine compounds in human urine was developed and validated. Aliquots of 0.5 mL of urine specimens were used for the analysis and the benzodiazepines were extracted by single step methanol (containing 0.2% formic acid) precipitation and then separated on a BEH C18 (50 mm 2.1 mm, 1.7 m) analytical column with the temperature maintained at 45C. The mobile phases consisted of methanol and water (both containing 0.2% formic acid) and the flow rate was 0.4 mL/min. The TQ detector, equipped with an electrospray ionization ion source, was set up with a positive mode. The acquisitions were performed in multiple-reaction monitoring (MRM) and the limit of quantification was 20 ng/mL for all of the 13 compounds. The low limits of detections (LODs) of the benzodiazepines in this method were between 0.5 and 2 ng/mL. The chromatographic separation time was 4 min and calibration curves in human urine were generated over the range of 20-2000 ng/mL. The method validation parameters such as accuracy, precision, carryover, recovery, stability, and specificity for all of the 13 compounds were within the acceptable range. This method is suitable for the high throughput screening of benzodiazepines in clinical laboratories.