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Influenza Surveillance at IRID Immunization and Respiratory Infections Division Centre for Infectious Disease Prevention & Control Public Health Agency of Canada
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Impact of Influenza In Canada: 10-25% of population affected yearly (higher infection rates in children and elderly) 70-75,000 hospitalizations 6-7,000 deaths due to pneumonia and influenza 500-1,500 deaths due to influenza
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Canada’s National Influenza Surveillance Program Primary Objectives : 1) Early detection and monitoring of influenza outbreaks 2) Provide timely and up-to-date reporting of influenza activity in Canada and abroad to professionals & public 3) Monitor circulating strains of influenza virus, including new sub- types 4) Contribute to the information for vaccine composition for following season
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Influenza Surveillance ILI ConsultationsSentinel Physicians LaboratoriesNumber of Influenza tests and positives National Microbiology Laboratory Strain Characterization Provincial/Territorial Epidemiologists Influenza activity levels (outbreaks etc) Data ProviderIndicator
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Uses of Surveillance Data estimating disease impact –influenza-like illness clinic visits –influenza and pneumonia hospitalizations and deaths –all cause mortality –other health and economic impacts monitoring viral evolution –identification of predominant strains –detection of new strains/subtypes Influenza prevention and control policies Vaccine composition program development and timing
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Number of Influenza regions reporting widespread or localized activity
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Seasonal Distributuion of Laboratory Confirmed Influenza Infections by influenza type, Canada 1997-2004
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Influenza Tests, % positive, & ILI rates, Canada, by report week, 2003-2004
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Proportion of lab-confirmed influenza by age- group, Canada, 2003-2004
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Influenza Strain Identification
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Influenza Activity Level by Provincial and Territorial Influenza Surveillance Regions, Canada, Week 03 2004
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FluWatch on the Web http://www.phac-aspc.gc.ca/fluwatch/index.html
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New Initiatives…. Impact of influenza in children - hospitalizations Sentinel hospital-based surveillance Trained nurse monitor at each centre identifies eligible cases and completes detailed case report forms
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New Initiatives.. Canadian Network for Public Health Intelligence (CNPHI) CNPHI is a secure internet-based suite of applications and resources. It is primarily directed towards strategic public health information and intelligence sharing. Included applications: –Atlantic Canada FluWatch Application –Canadian Integrated Outbreak Surveillance Centre (CIOSC).
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New Initiatives: CNPHI
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Canadian Integrated Outbreak Surveillance Centre (CIOSC)
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Goal: To enhance public health’s capacity to anticipate and detect health risks associated with communicable disease threats.
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SRI Alerts: An SRI alert is an operational definition used to ensure that individuals meeting specific criteria are identified in a systematic way to allow for implementation of appropriate infection control and public health measures until SARS or other emerging respiratory pathogen has been ruled out as a cause of the illness Severe Respiratory Illness (SRI) Surveillance
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SRI Alerts An SRI alert is sent under the following situations: An individual is hospitalized with an SRI and has a potential epidemiologic link to a source of emerging respiratory pathogen Clusters of SRI are identified within a health care unit An individual has been identified with laboratory evidence of a SARS-CoV infection (or other emerging respiratory infection) An individual has been identified with a laboratory confirmed influenza A/ H5N1 or other novel influenza virus infection
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