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1.
Clin Infect Dis ; 77(2): 303-311, 2023 07 26.
Artigo em Inglês | MEDLINE | ID: mdl-36942534

RESUMO

BACKGROUND: Older adults are recommended to receive influenza vaccination annually, and many use statins. Statins have immunomodulatory properties that might modify influenza vaccine effectiveness (VE) and alter influenza infection risk. METHODS: Using the test-negative design and linked laboratory and health administrative databases in Ontario, Canada, we estimated VE against laboratory-confirmed influenza among community-dwelling statin users and nonusers aged ≥66 years during the 2010-2011 to 2018-2019 influenza seasons. We also estimated the odds ratio for influenza infection comparing statin users and nonusers by vaccination status. RESULTS: Among persons tested for influenza across the 9 seasons, 54 243 had continuous statin exposure before testing and 48 469 were deemed unexposed. The VE against laboratory-confirmed influenza was similar between statin users and nonusers (17% [95% confidence interval, 13%-20%] and 17% [13%-21%] respectively; test for interaction, P = .87). In both vaccinated and unvaccinated persons, statin users had higher odds of laboratory-confirmed influenza than nonusers (odds ratios for vaccinated and unvaccinated persons 1.15 [95% confidence interval, 1.10-1.21] and 1.15 [1.10-1.20], respectively). These findings were consistent by mean daily dose and statin type. VE did not differ between users and nonusers of other cardiovascular drugs, except for ß-blockers. We did not observe that vaccinated and unvaccinated users of these drugs had increased odds of influenza, except for unvaccinated ß-blocker users. CONCLUSIONS: Influenza VE did not differ between statin users and nonusers. Statin use was associated with increased odds of laboratory-confirmed influenza in vaccinated and unvaccinated persons, but these associations might be affected by residual confounding.


Assuntos
Inibidores de Hidroximetilglutaril-CoA Redutases , Vacinas contra Influenza , Influenza Humana , Humanos , Idoso , Influenza Humana/epidemiologia , Influenza Humana/prevenção & controle , Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Eficácia de Vacinas , Vacinação , Ontário/epidemiologia , Estações do Ano
2.
BMC Public Health ; 23(1): 160, 2023 01 24.
Artigo em Inglês | MEDLINE | ID: mdl-36694174

RESUMO

OBJECTIVES: In 2014, Ontario's Point-of-Care (POC) test providers were advised to focus efforts on provincially defined priority populations who experience a greater risk of HIV. Our objective was to describe the POC program before, during and after this change, including tester characteristics, follow-up testing results, positive predictive value (PPV) over time, and trends and characteristics of those with reactive test results without a confirmatory serological specimen. METHODS: Test-level data of POC screening and confirmatory results were extracted from the Public Health Ontario HIV Datamart. Final test results were defined based on results of the confirmatory blood sample, or the POC test for "non-reactive" tests. Testing volumes, percent of total tests, percent positivity and PPV were calculated overall, annually, and by exposure group. RESULTS: Overall testing volumes decreased by 39.8% between 2014 and 2018. The majority of confirmed positive tests were in the men who have sex with men (MSM) exposure category, followed by HIV-endemic and heterosexual - no identified risk (heterosexual-NIR). Overall percent positivity decreased from 0.59% in 2011 to 0.42% in 2015 (change of 0.17%, 95% CI 0.03% to 0.31%), increasing to 0.69% in 2018 (change of 0.27%, 95% CI 0.20% to 0.34%). Increases in percent positivity corresponded with a decrease in the overall proportion of tests conducted in low-risk populations. When compared to the heterosexual-NIR category, PPV was significantly higher for men who have sex with men - people who use injection drugs (MSM-PWID) (52.7% compared to 100%, P < .001), MSM (52.7% compared to 95.4%, P < .001), HIV-endemic (52.7% compared to 91.5%, P < .001), heterosexual - partner with identified risk (heterosexual-PIR) (52.7% compared to 77.3%, P = .042), and people who use injection drugs (PWID) (52.7% compared to 81.3%, P = 0.007). A total of 13.5% of reactive POC results did not have a serological sample submitted. CONCLUSIONS: Targeted testing towards populations at higher risk of HIV improved the overall test performance characteristics of Ontario's POC testing program. While not unexpected, the large discrepancies between PPV in higher-risk, compared to lower-risk populations, suggests the need for greater awareness and messaging of the likelihood of false positive test results in different populations.


Assuntos
Infecções por HIV , Minorias Sexuais e de Gênero , Abuso de Substâncias por Via Intravenosa , Masculino , Humanos , Homossexualidade Masculina , Infecções por HIV/diagnóstico , Infecções por HIV/epidemiologia , Infecções por HIV/prevenção & controle , Ontário/epidemiologia , Fatores de Risco , Testes Imediatos
3.
BMC Public Health ; 23(1): 420, 2023 03 02.
Artigo em Inglês | MEDLINE | ID: mdl-36864415

RESUMO

BACKGROUND: The COVID-19 pandemic continues to demonstrate the risks and profound health impacts that result from infectious disease emergencies. Emergency preparedness has been defined as the knowledge, capacity and organizational systems that governments, response and recovery organizations, communities and individuals develop to anticipate, respond to, or recover from emergencies. This scoping review explored recent literature on priority areas and indicators for public health emergency preparedness (PHEP) with a focus on infectious disease emergencies. METHODS: Using scoping review methodology, a comprehensive search was conducted for indexed and grey literature with a focus on records published from 2017 to 2020 onward, respectively. Records were included if they: (a) described PHEP, (b) focused on an infectious emergency, and (c) were published in an Organization for Economic Co-operation and Development country. An evidence-based all-hazards Resilience Framework for PHEP consisting of 11 elements was used as a reference point to identify additional areas of preparedness that have emerged in recent publications. The findings were analyzed deductively and summarized thematically. RESULTS: The included publications largely aligned with the 11 elements of the all-hazards Resilience Framework for PHEP. In particular, the elements related to collaborative networks, community engagement, risk analysis and communication were frequently observed across the publications included in this review. Ten emergent themes were identified that expand on the Resilience Framework for PHEP specific to infectious diseases. Planning to mitigate inequities was a key finding of this review, it was the most frequently identified emergent theme. Additional emergent themes were: research and evidence-informed decision making, building vaccination capacity, building laboratory and diagnostic system capacity, building infection prevention and control capacity, financial investment in infrastructure, health system capacity, climate and environmental health, public health legislation and phases of preparedness. CONCLUSION: The themes from this review contribute to the evolving understanding of critical public health emergency preparedness actions. The themes expand on the 11 elements outlined in the Resilience Framework for PHEP, specifically relevant to pandemics and infectious disease emergencies. Further research will be important to validate these findings, and expand understanding of how refinements to PHEP frameworks and indicators can support public health practice.


Assuntos
COVID-19 , Defesa Civil , Doenças Transmissíveis , Humanos , Saúde Pública , COVID-19/epidemiologia , Emergências , Pandemias/prevenção & controle , Doenças Transmissíveis/epidemiologia , Doenças Transmissíveis/terapia
4.
Clin Infect Dis ; 74(4): 703-706, 2022 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-34105720

RESUMO

We compared secondary attack rates in households with B.1.1.7 variant of concern (VOC) versus non-VOC index cases in a matched cohort in Ontario, Canada. The secondary attack rate for VOC index cases was 1.31 times higher than non-VOC index cases. This increase was particularly accentuated for asymptomatic or presymptomatic index cases.


Assuntos
COVID-19 , SARS-CoV-2 , Humanos , Incidência , Ontário/epidemiologia
5.
Occup Environ Med ; 79(6): 403-411, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35022260

RESUMO

OBJECTIVES: The objective of our study was to estimate the rate of workplace outbreak-associated cases of COVID-19 by industry in labour market participants aged 15-69 years who reported working the majority of hours outside the home in Ontario, Canada. METHODS: We conducted a population-based cross-sectional study of COVID-19 workplace outbreaks and associated cases reported in Ontario between 1 April 2020 and 31 March 2021. All outbreaks were manually classified into two-digit North American Industry Classification System codes. We obtained monthly denominator estimates from the Statistics Canada Labour Force Survey to estimate the incidence of outbreak-associated cases per 100 000 000 hours among individuals who reported the majority of hours were worked outside the home. We performed this analysis across industries and in three distinct time periods. RESULTS: Overall, 12% of cases were attributed to workplace outbreaks among working-age adults across our study period. While incidence varied across the time periods, the five industries with the highest incidence rates across our study period were agriculture, healthcare and social assistance, food manufacturing, educational services, and transportation and warehousing. CONCLUSIONS: Certain industries have consistently increased the incidence of COVID-19 over the course of the pandemic. These results may assist in ongoing efforts to reduce transmission of COVID-19 by prioritising resources, as well as industry-specific guidance, vaccination and public health messaging.


Assuntos
COVID-19 , Adulto , COVID-19/epidemiologia , Estudos Transversais , Surtos de Doenças , Humanos , Incidência , Ontário/epidemiologia
6.
Clin Infect Dis ; 73(5): e1191-e1199, 2021 09 07.
Artigo em Inglês | MEDLINE | ID: mdl-33354709

RESUMO

BACKGROUND: Older adults are at increased risk of mortality from influenza infections. We estimated influenza vaccine effectiveness (VE) against mortality following laboratory-confirmed influenza. METHODS: Using a test-negative design study and linked laboratory and health administrative databases in Ontario, Canada, we estimated VE against all-cause mortality following laboratory-confirmed influenza for community-dwelling adults aged >65 years during the 2010-2011 to 2015-2016 influenza seasons. RESULTS: Among 54 116 older adults tested for influenza across the 6 seasons, 6837 died within 30 days of specimen collection. Thirteen percent (925 individuals) tested positive for influenza, and 50.6% were considered vaccinated for that season. Only 23.2% of influenza test-positive cases had influenza recorded as their underlying cause of death. Before and after multivariable adjustment, we estimated VE against all-cause mortality following laboratory-confirmed influenza to be 20% (95% confidence interval [CI], 8%-30%) and 20% (95% CI, 7%-30%), respectively. This estimate increased to 34% after correcting for influenza vaccination exposure misclassification. We observed significant VE against deaths following influenza confirmation during 2014-2015 (VE = 26% [95% CI, 5%-42%]). We also observed significant VE against deaths following confirmation of influenza A/H1N1 and A/H3N2, and against deaths with COPD as the underlying cause. CONCLUSIONS: These results support the importance of influenza vaccination in older adults, who account for most influenza-associated deaths annually.


Assuntos
Vírus da Influenza A Subtipo H1N1 , Vacinas contra Influenza , Influenza Humana , Idoso , Estudos de Casos e Controles , Humanos , Vírus da Influenza A Subtipo H3N2 , Vírus da Influenza B , Influenza Humana/epidemiologia , Influenza Humana/prevenção & controle , Laboratórios , Ontário/epidemiologia , Estações do Ano , Vacinação
7.
Sex Transm Dis ; 48(7): 481-487, 2021 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-33315748

RESUMO

BACKGROUND: Clinical prediction rules (CPRs) can be used in sexually transmitted infection (STI) testing environments to prioritize individuals at the highest risk of infection and optimize resource allocation. We previously derived a CPR to predict asymptomatic chlamydia and/or gonorrhea (CT/NG) infection among women and heterosexual men at in-person STI clinics based on 5 predictors. Population differences between clinic-based and Internet-based testers may limit the tool's application across settings. The primary objective of this study was to assess the validity, sensitivity, and overall performance of this CPR within an Internet-based testing environment (GetCheckedOnline.com). METHODS: We analyzed GetCheckedOnline online risk assessment and laboratory data from October 2015 to June 2019. We compared the STI clinic population used for CPR derivation (data previously published) and the GetCheckedOnline validation population using χ2 tests. Calibration and discrimination were assessed using the Hosmer-Lemeshow goodness-of-fit test and the area under the receiver operating curve, respectively. Sensitivity and the fraction of total screening tests offered were quantified for CPR-predicted risk scores. RESULTS: Asymptomatic CT/NG infection prevalence in the GetCheckedOnline population (n = 5478) was higher than in the STI clinic population (n = 10,437; 2.4% vs. 1.8%, P = 0.007). When applied to GetCheckedOnline, the CPR had reasonable calibration (Hosmer-Lemeshow, P = 0.90) and discrimination (area under the receiver operating characteristic, 0.64). By screening only individuals with total risk scores ≥4, we would detect 97% of infections and reduce screening by 14%. CONCLUSIONS: The application of an existing CPR to detect asymptomatic CT/NG infection is valid within an Internet-based STI testing environment. Clinical prediction rules applied online can reduce unnecessary STI testing and optimize resource allocation within publicly funded health systems.


Assuntos
Infecções por Chlamydia , Chlamydia , Gonorreia , Infecções Sexualmente Transmissíveis , Infecções por Chlamydia/diagnóstico , Infecções por Chlamydia/epidemiologia , Chlamydia trachomatis , Regras de Decisão Clínica , Feminino , Gonorreia/diagnóstico , Gonorreia/epidemiologia , Humanos , Internet , Masculino , Prevalência
8.
CMAJ ; 193(19): E681-E688, 2021 05 10.
Artigo em Inglês | MEDLINE | ID: mdl-33972221

RESUMO

BACKGROUND: The implementation of outbreak management measures has decreased the frequency and severity of SARS-CoV-2 outbreaks in Ontario long-term care homes. We describe the epidemiological and laboratory data from one of the first such outbreaks in Ontario to assess factors associated with its severity, and the impact of progressive interventions for infection control over the course of the outbreak. METHODS: We obtained line list and outbreak data from the public health unit to describe resident and staff cases, severity and distribution of cases over time and within the outbreak facility. Where available, we obtained data on laboratory specimens from the Public Health Ontario Laboratory and performed whole genome sequencing and phylogenetic analysis of viral specimens from the outbreak. RESULTS: Among 65 residents of the long-term care home, 61 (94%) contracted SARS-CoV-2, with a case fatality rate of 45% (28/61). Among 67 initial staff, 34 (51%) contracted the virus and none died. When the outbreak was declared, 12 staff, 2 visitors and 9 residents had symptoms. Resident cases were located in 3 of 4 areas of the home. Phylogenetic analysis showed tight clustering of cases, with only 1 additional strain of genetically distinct SARS-CoV-2 identified from a staff case in the third week of the outbreak. No cases were identified among 26 new staff brought into the home after full outbreak measures were implemented. INTERPRETATION: Rapid and undetected viral spread in a long-term care home led to high rates of infection among residents and staff. Progressive implementation of outbreak measures after the peak of cases prevented subsequent staff cases and are now part of long-term care outbreak policy in Ontario.


Assuntos
COVID-19/epidemiologia , Assistência de Longa Duração , Casas de Saúde , COVID-19/mortalidade , COVID-19/prevenção & controle , COVID-19/virologia , Humanos , Controle de Infecções , Ontário/epidemiologia , Pandemias , Filogenia , SARS-CoV-2/genética
9.
Clin Infect Dis ; 71(16): 2285-2288, 2020 11 19.
Artigo em Inglês | MEDLINE | ID: mdl-32442261

RESUMO

Influenza vaccine effectiveness against influenza and noninfluenza respiratory viruses (NIRVs) was assessed by test-negative design using historic datasets of the community-based Canadian Sentinel Practitioner Surveillance Network, spanning 2010-2011 to 2016-2017. Vaccine significantly reduced the risk of influenza illness by >40% with no effect on coronaviruses or other NIRV risk.


Assuntos
Infecções por Coronavirus/epidemiologia , Vacinas contra Influenza/imunologia , Influenza Humana/prevenção & controle , Infecções Respiratórias/virologia , Adolescente , Adulto , Idoso , Canadá/epidemiologia , Estudos de Casos e Controles , Criança , Pré-Escolar , Infecções por Coronavirus/etiologia , Feminino , Humanos , Imunogenicidade da Vacina , Lactente , Vacinas contra Influenza/administração & dosagem , Influenza Humana/epidemiologia , Masculino , Pessoa de Meia-Idade , Infecções Respiratórias/prevenção & controle , Estudos Retrospectivos , Fatores de Risco , Estações do Ano , Vigilância de Evento Sentinela , Adulto Jovem
10.
Euro Surveill ; 25(7)2020 02.
Artigo em Inglês | MEDLINE | ID: mdl-32098644

RESUMO

Interim results from Canada's Sentinel Practitioner Surveillance Network show that during a season characterised by early co-circulation of influenza A and B viruses, the 2019/20 influenza vaccine has provided substantial protection against medically-attended influenza illness. Adjusted VE overall was 58% (95% confidence interval (CI): 47 to 66): 44% (95% CI: 26 to 58) for A(H1N1)pdm09, 62% (95% CI: 37 to 77) for A(H3N2) and 69% (95% CI: 57 to 77) for influenza B viruses, predominantly B/Victoria lineage.


Assuntos
Vírus da Influenza A Subtipo H1N1/isolamento & purificação , Vírus da Influenza A Subtipo H3N2/isolamento & purificação , Vírus da Influenza B/isolamento & purificação , Vacinas contra Influenza/administração & dosagem , Influenza Humana/epidemiologia , Influenza Humana/prevenção & controle , Adolescente , Adulto , Idoso , Antígenos Virais/análise , Canadá/epidemiologia , Criança , Pré-Escolar , Feminino , Genótipo , Testes de Inibição da Hemaglutinação , Humanos , Lactente , Vírus da Influenza A Subtipo H1N1/genética , Vírus da Influenza A Subtipo H1N1/imunologia , Vírus da Influenza A Subtipo H3N2/genética , Vírus da Influenza A Subtipo H3N2/imunologia , Vírus da Influenza B/genética , Vírus da Influenza B/imunologia , Vacinas contra Influenza/imunologia , Masculino , Pessoa de Meia-Idade , Dados de Sequência Molecular , Nasofaringe/virologia , Nariz/virologia , Reação em Cadeia da Polimerase em Tempo Real , Estações do Ano , Vigilância de Evento Sentinela , Análise de Sequência de DNA , Adulto Jovem
11.
BMC Public Health ; 19(1): 567, 2019 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-31088426

RESUMO

BACKGROUND: Since 2009, in Ontario, reportable disease surveillance data has been used for timely in-season estimates of influenza severity (i.e., hospitalizations and deaths). Due to changes in reporting requirements influenza reporting no longer captures these indicators of severity, necessitating exploration of other potential sources of data. The purpose of this study was to complete a retrospective analysis to assess the comparability of influenza-related hospitalizations and deaths captured in the Ontario reportable disease information system to those captured in Ontario's hospital-based discharge database. METHODS: Hospitalizations and deaths of laboratory-confirmed influenza cases reported during the 2010-11 to 2013-14 influenza seasons were analyzed. Information on hospitalizations and deaths for laboratory-confirmed influenza cases were obtained from two databases; the integrated Public Health Information System, which is the provincial reportable disease database, and the Discharge Abstract Database, which contains information on all in-patient hospital visits using the International Classification of Diseases, 10th Revision, Canada (ICD-10-CA) coding standards. Analyses were completed using the ICD-10 J09 and J10 diagnosis codes as an indicator for laboratory-confirmed influenza, and a secondary analysis included the physician-diagnosed influenza J11 diagnosis code. RESULTS: For each season, reported hospitalizations for laboratory-confirmed influenza cases in the reportable disease data were higher compared to hospitalizations with J09 and J10 diagnoses codes, but lower when J11 codes were included. The number of deaths was higher in the reportable disease data, whether or not J11 codes were included. For all four seasons, the weekly trends in the number of hospitalizations and deaths were similar for the reportable disease and hospital data (with and without J11), with seasonal peaks occurring during the same week or within 1 week of each other. CONCLUSION: In our retrospective analyses we found that hospital data provided a reliable estimate of the trends of influenza-related hospitalizations and deaths compared to the reportable disease data for the 2010-11 to 2013-14 influenza seasons in Ontario, but may under-estimate the total seasonal number of deaths. Hospital data could be used for retrospective end-of-season assessments of severity, but due to delays in data availability are unlikely to be timely estimates of severity during in-season surveillance.


Assuntos
Hospitalização/estatística & dados numéricos , Influenza Humana/mortalidade , Armazenamento e Recuperação da Informação/estatística & dados numéricos , Alta do Paciente/estatística & dados numéricos , Adulto , Idoso , Bases de Dados Factuais , Feminino , Hospitais/estatística & dados numéricos , Humanos , Classificação Internacional de Doenças , Notificação de Abuso , Pessoa de Meia-Idade , Ontário/epidemiologia , Reprodutibilidade dos Testes , Estudos Retrospectivos , Estações do Ano
12.
Euro Surveill ; 24(15)2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30994107

RESUMO

IntroductionFindings from the community-based Canadian Sentinel Practitioner Surveillance Network (SPSN) suggest children were more affected by the 2018/19 influenza A(H1N1)pdm09 epidemic.AimTo compare the age distribution of A(H1N1)pdm09 cases in 2018/19 to prior seasonal influenza epidemics in Canada.MethodsThe age distribution of unvaccinated influenza A(H1N1)pdm09 cases and test-negative controls were compared across A(H1N1)pdm09-dominant epidemics in 2018/19, 2015/16 and 2013/14 and with the general population of SPSN provinces. Similar comparisons were undertaken for influenza A(H3N2)-dominant epidemics.ResultsIn 2018/19, more influenza A(H1N1)pdm09 cases were under 10 years old than controls (29% vs 16%; p < 0.001). In particular, children aged 5-9 years comprised 14% of cases, greater than their contribution to controls (4%) or the general population (5%) and at least twice their contribution in 2015/16 (7%; p < 0.001) or 2013/14 (5%; p < 0.001). Conversely, children aged 10-19 years (11% of the population) were under-represented among A(H1N1)pdm09 cases versus controls in 2018/19 (7% vs 12%; p < 0.001), 2015/16 (7% vs 13%; p < 0.001) and 2013/14 (9% vs 12%; p = 0.12).ConclusionChildren under 10 years old contributed more to outpatient A(H1N1)pdm09 medical visits in 2018/19 than prior seasonal epidemics in Canada. In 2018/19, all children under 10 years old were born after the 2009 A(H1N1)pdm09 pandemic and therefore lacked pandemic-induced immunity. In addition, more than half those born after 2009 now attend school (i.e. 5-9-year-olds), a socio-behavioural context that may enhance transmission and did not apply during prior A(H1N1)pdm09 epidemics.


Assuntos
Vírus da Influenza A Subtipo H1N1/isolamento & purificação , Influenza Humana/epidemiologia , Influenza Humana/virologia , Adolescente , Adulto , Distribuição por Idade , Idoso , Canadá/epidemiologia , Criança , Pré-Escolar , Efeito de Coortes , Epidemias , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estações do Ano , Vigilância de Evento Sentinela , Adulto Jovem
13.
Euro Surveill ; 24(46)2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31771709

RESUMO

IntroductionThe Canadian Sentinel Practitioner Surveillance Network reports vaccine effectiveness (VE) for the 2018/19 influenza A(H3N2) epidemic.AimTo explain a paradoxical signal of increased clade 3C.3a risk among 35-54-year-old vaccinees, we hypothesise childhood immunological imprinting and a cohort effect following the 1968 influenza A(H3N2) pandemic.MethodsWe assessed VE by test-negative design for influenza A(H3N2) overall and for co-circulating clades 3C.2a1b and 3C.3a. VE variation by age in 2018/19 was compared with amino acid variation in the haemagglutinin glycoprotein by year since 1968.ResultsInfluenza A(H3N2) VE was 17% (95% CI: -13 to 39) overall: 27% (95% CI: -7 to 50) for 3C.2a1b and -32% (95% CI: -119 to 21) for 3C.3a. Among 20-64-year-olds, VE was -7% (95% CI: -56 to 26): 6% (95% CI: -49 to 41) for 3C.2a1b and -96% (95% CI: -277 to -2) for 3C.3a. Clade 3C.3a VE showed a pronounced negative dip among 35-54-year-olds in whom the odds of medically attended illness were > 4-fold increased for vaccinated vs unvaccinated participants (p < 0.005). This age group was primed in childhood to influenza A(H3N2) viruses that for two decades following the 1968 pandemic bore a serine at haemagglutinin position 159, in common with contemporary 3C.3a viruses but mismatched to 3C.2a vaccine strains instead bearing tyrosine.DiscussionImprinting by the first childhood influenza infection is known to confer long-lasting immunity focused toward priming epitopes. Our findings suggest vaccine mismatch may negatively interact with imprinted immunity. The immunological mechanisms for imprint-regulated effect of vaccine (I-REV) warrant investigation.


Assuntos
Memória Imunológica , Vírus da Influenza A Subtipo H3N2/isolamento & purificação , Vacinas contra Influenza/administração & dosagem , Influenza Humana/prevenção & controle , Vigilância da População/métodos , Vacinação/estatística & dados numéricos , Potência de Vacina , Adulto , Fatores Etários , Canadá/epidemiologia , Feminino , Glicoproteínas de Hemaglutininação de Vírus da Influenza/genética , Humanos , Vírus da Influenza A Subtipo H3N2/genética , Vírus da Influenza A Subtipo H3N2/imunologia , Vacinas contra Influenza/imunologia , Influenza Humana/epidemiologia , Influenza Humana/imunologia , Influenza Humana/virologia , Masculino , Pessoa de Meia-Idade , Vigilância de Evento Sentinela
14.
Euro Surveill ; 24(4)2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30696523

RESUMO

Using a test-negative design, the Canadian Sentinel Practitioner Surveillance Network assessed interim 2018/19 vaccine effectiveness (VE) against predominant influenza A(H1N1)pdm09 viruses. Adjusted VE was 72% (95% confidence interval: 60 to 81) against medically attended, laboratory-confirmed influenza A(H1N1)pdm09 illness. This substantial vaccine protection was observed in all age groups, notably young children who appeared to be disproportionately affected. Sequence analysis identified heterogeneity in emerging clade 6B.1 viruses but no dominant drift variant.


Assuntos
Vírus da Influenza A Subtipo H1N1/isolamento & purificação , Vacinas contra Influenza/administração & dosagem , Influenza Humana/prevenção & controle , Vacinação/estatística & dados numéricos , Potência de Vacina , Adolescente , Adulto , Idoso , Canadá/epidemiologia , Estudos de Casos e Controles , Criança , Pré-Escolar , Feminino , Testes de Inibição da Hemaglutinação , Humanos , Lactente , Vírus da Influenza A Subtipo H1N1/genética , Vírus da Influenza A Subtipo H1N1/imunologia , Vacinas contra Influenza/imunologia , Influenza Humana/epidemiologia , Influenza Humana/virologia , Masculino , Pessoa de Meia-Idade , Nasofaringe/virologia , Nariz/virologia , Avaliação de Resultados em Cuidados de Saúde , Reação em Cadeia da Polimerase em Tempo Real , Estações do Ano , Sensibilidade e Especificidade , Vigilância de Evento Sentinela , Análise de Sequência de DNA
15.
Foodborne Pathog Dis ; 15(9): 554-559, 2018 09.
Artigo em Inglês | MEDLINE | ID: mdl-29958009

RESUMO

There has been a steady increase in illness incidence of Vibrio parahaemolyticus (Vp). The majority of illnesses are associated with consumption of raw oysters. In the summer of 2015, Canada experienced the largest outbreak associated with the consumption of raw oysters harvested from British Columbia (BC) coastal waters. Case investigation of laboratory-confirmed cases was conducted to collect information on exposures and to assist traceback. Investigations at processors and oyster sampling were conducted. Eighty-two laboratory-confirmed cases of Vp infection were reported between January 1 and October 26, 2015. The majority of the cases were reported in BC, associated with consumption of raw BC oysters in restaurants. Sea surface temperatures were above the historical levels in 2015. This outbreak identified the need to improve surveillance and response to increases in human cases of Vp. This is of particular importance due to the potential for increasing water temperatures and the likelihood of additional outbreaks of Vibrio.


Assuntos
Doenças Transmitidas por Alimentos/epidemiologia , Gastroenterite/microbiologia , Ostreidae/microbiologia , Intoxicação por Frutos do Mar , Vibrioses/epidemiologia , Vibrio parahaemolyticus/isolamento & purificação , Adulto , Animais , Canadá/epidemiologia , Surtos de Doenças , Fezes/microbiologia , Feminino , Microbiologia de Alimentos , Doenças Transmitidas por Alimentos/microbiologia , Gastroenterite/epidemiologia , Humanos , Masculino , Restaurantes , Frutos do Mar/microbiologia , Temperatura , Vibrio parahaemolyticus/classificação
16.
Can J Infect Dis Med Microbiol ; 2017: 9854103, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28656051

RESUMO

Timely surveillance of enteric diseases is necessary to identify and control cases and outbreaks. Our objective was to evaluate the timeliness of enteric disease surveillance in British Columbia, Canada, compare these results to other settings, and recommend improvements. In 2012 and 2013, information was collected from case report forms and laboratory information systems on 2615 Salmonella, shigatoxin-producing E. coli, Shigella, and Listeria infections. Twelve date variables representing the surveillance process from onset of symptoms to case interview and final laboratory results were collected, and intervals were measured. The median time from onset of symptoms to reporting subtyping results to BC epidemiologists was 26-36 days and from onset of symptoms to case interview was 12-14 days. Our findings were comparable to the international literature except for a longer time (up to 29 day difference) to reporting of PFGE results to epidemiologists in BC. Such a delay may impact our ability to identify and solve outbreaks. Several process and system changes were implemented which should improve the timeliness of enteric disease surveillance.

19.
CMAJ ; 193(28): E1098-E1106, 2021 07 19.
Artigo em Francês | MEDLINE | ID: mdl-34281972

RESUMO

CONTEXTE: Le déploiement de mesures de gestion des éclosions de SRAS-CoV-2 dans les établissements de soins de longue durée en Ontario a permis d'en réduire la fréquence et la gravité. Nous décrivons ici les données épidémiologiques et de laboratoire d'une de ces premières éclosions en Ontario afin de déterminer les facteurs associés à son importance et les impacts des interventions progressives de lutte contre les infections appliquées pendant la durée de l'éclosion. MÉTHODES: Nous avons obtenu du bureau de santé la liste des cas et les données de l'éclosion afin de décrire les cas chez les résidents et le personnel, leur gravité et leur distribution dans le temps et à l'intérieur de l'établissement touché. Quand elles étaient disponibles, nous avons obtenu des données concernant les échantillons soumis au laboratoire de Santé publique Ontario et effectué un séquençage complet et une analyse phylogénétique des échantillons viraux de l'éclosion. RÉSULTATS: Sur les 65 résidents de l'établissement de soins de longue durée, 61 (94 %) ont contracté le SRAS-CoV-2, le taux de létalité étant de 45 % (28/61). Parmi les 67 employés initiaux, 34 (51 %) ont contracté le virus, et aucun n'est décédé. Lorsque l'éclosion a été déclarée, 12 employés, 2 visiteurs et 9 résidents présentaient des symptômes. Parmi les résidents, les cas se trouvaient dans 3 des 4 secteurs de l'établissement. L'analyse phylogénétique a montré une forte similitude des séquences; une seule autre souche de SRAS-CoV-2 génétiquement distincte a été identifiée chez un employé à la troisième semaine de l'éclosion. Après le déploiement de toutes les mesures de gestion de l'éclosion, aucun cas n'a été identifié parmi les 26 nouveaux employés appelés en renfort. INTERPRÉTATION: La propagation rapide et non détectée du virus dans un établissement de soins de longue durée a donné lieu à des taux élevés d'infection chez les résidents et le personnel. L'application progressive de mesures de gestion après le pic de l'éclosion a permis d'éviter la contamination du personnel appelé en renfort et fait désormais partie des politiques à long terme de prévention des éclosions en Ontario.


Assuntos
COVID-19/epidemiologia , Assistência de Longa Duração/estatística & dados numéricos , Pandemias , SARS-CoV-2 , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Ontário/epidemiologia , Estudos Retrospectivos , Adulto Jovem
20.
BMC Public Health ; 16: 430, 2016 05 24.
Artigo em Inglês | MEDLINE | ID: mdl-27220629

RESUMO

BACKGROUND: Extreme hot and dry weather during summer 2012 resulted in some of the most devastating drought conditions in the last half-century in the United States (U.S.). While public drinking water systems have contingency plans and access to alternative resources to maintain supply for their customers during drought, little is known about the impacts of drought on private well owners, who are responsible for maintaining their own water supply. The purpose of this investigation was to explore the public health impacts of the 2012 drought on private well owners' water quality and quantity, identify their needs for planning and preparing for drought, and to explore their knowledge, attitudes, and well maintenance behaviors during drought. METHODS: In the spring of 2013, we conducted six focus group discussions with private well owners in Arkansas, Indiana, and Oklahoma. RESULTS: There were a total of 41 participants, two-thirds of whom were men aged 55 years or older. While participants agreed that 2012 was the worst drought in memory, few experienced direct impacts on their water quantity or quality. However, all groups had heard of areas or individuals whose wells had run dry. Participants conserved water by reducing their indoor and outdoor consumption, but they had few suggestions on additional ways to conserve, and they raised concerns about limiting water use too much. Participants wanted information on how to test their well and any water quality issues in their area. CONCLUSIONS: This investigation identified information needs regarding drought preparedness and well management for well owners.


Assuntos
Secas , Propriedade , Abastecimento de Água , Poços de Água , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Grupos Focais , Humanos , Masculino , Pessoa de Meia-Idade , Estados Unidos , Microbiologia da Água , Qualidade da Água , Adulto Jovem
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