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British Columbia Influenza Surveillance Bulletin 2012-13 Weeks 13-15

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  • #16
    Re: British Columbia Influenza Surveillance Bulletin 2012-13 Weeks 9-10

    BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN
    2012-13: Number 17, Weeks 9-10
    February 24 to March 9, 2013

    Influenza activity in BC continues at low levels

    Summary

    In weeks 9-10 (February 24 to March 9, 2013), most indicators suggest that influenza activity in BC remains low. The proportion of medical visits with an influenza diagnosis remained below seasonal norms throughout the province. The proportion of patients with influenza-like illness among those presenting to sentinel physicians was lower than the previous week and within the expected range for this time of year. Less than a quarter of the specimens tested at the provincial laboratory were positive for influenza, still predominantly influenza A, but with an increasing B contribution. No lab-confirmed influenza outbreaks were reported during this period. Compared to the previous week, the average proportion of consultations during this period for influenza-like illness at BC Children?s Hospital emergency room declined slightly. At the BC Children and Women?s Centre Laboratory, the percentage of influenza viruses detected continued to decrease, and the proportion of respiratory syncytial virus detections declined sharply but remained the most common virus detected.
    ...
    Laboratory Reports
    As reported by the BC Public Health Microbiology & Reference Laboratory, PHSA for weeks 9-10, four hundred and sixty-two specimens were tested for influenza. Among them, 88 (19.0%) were positive, including 46 influenza A from all Health Authorities but Northern [21 A/H3N2, 10 A(H1N1)pdm09, 15 A (subtype pending)], and 42 influenza B from all Health Authorities. Compared to the previous week, the average proportion of influenza B among influenza-positive specimens during this period increased (42/88, 47.7%).
    ...
    ILI Outbreaks
    In weeks 9-10, no lab-confirmed influenza outbreaks were reported from long-term care facilities (LTCF). In total, 85 lab-confirmed influenza LTCF outbreaks have been reported in BC for the current season (since week 40, 30 September 2012): 36 in Fraser, 20 in Interior, 12 in Vancouver Coastal, 13 in Vancouver Island, and 4 in Northern Health Authority?. One outbreak from a LTCF in Northern Health Authority (parainfluenza) and four school ILI outbreaks (NHA: 3; IHA:1; all unknown pathogen) were further reported during this period. In the beginning of week 11, one school outbreak has been reported from NHA (unknown pathogen).
    ...

    Full report:
    http://www.bccdc.ca/NR/rdonlyres/5F2...910_201213.pdf
    "Safety and security don't just happen, they are the result of collective consensus and public investment. We owe our children, the most vulnerable citizens in our society, a life free of violence and fear."
    -Nelson Mandela

    Comment


    • #17
      Re: British Columbia Influenza Surveillance Bulletin 2012-13 Weeks 11-12

      BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN
      2012-13: Number 18, Weeks 11-12
      March 10 to 23, 2013


      Summary

      In weeks 11-12 (March 10 to 23, 2013), most indicators suggest that influenza activity in BC remains low. The proportion of medical visits with an influenza diagnosis was lower than the 10-year median throughout the province. The proportion of patients with influenza-like illness among those presenting to sentinel physicians was low and within the expected range for this time of year. Less than a quarter of the specimens tested at the provincial laboratory were positive for influenza, predominantly influenza B. One lab-confirmed influenza A/H3N2 outbreak was reported from a long-term care facility in Interior Health Authority in week 11. At the BC Children and Women?s Centre Laboratory, few influenza viruses were detected, but most of these were influenza B. RSV remained the most common virus detected overall.
      ...
      Laboratory Reports

      As reported by the BC Public Health Microbiology & Reference Laboratory, PHSA, for weeks 11-12, 365 specimens were tested for influenza. Among them, 64 (17.5%) were positive, including 23 influenza A from all Health Authorities but Northern [15 A/H3N2 and 8 A(H1N1)pdm09], and 41 influenza B from all Health Authorities. Of note, the proportion of influenza detections that are type B is on the rise, accounting for more than half of the influenza detections in each of the past three weeks. Other significant detections included RSV and rhino/enterovirus.
      ...
      ILI Outbreaks

      In weeks 11-12, one lab-confirmed influenza A/H3N2 outbreak was reported from a long-term care facility (LTCF) in IHA in week 11, bringing the total lab-confirmed influenza LTCF outbreaks in BC to 86 for the current season (since week 40, 30 September 2012): 36 in Fraser, 21 in Interior, 12 in Vancouver Coastal, 13 in Vancouver Island, and 4 in Northern Health Authority?. Two school ILI outbreaks were further reported from Northern Health Authority in week 11.
      ...
      Full report:
      http://www.bccdc.ca/NR/rdonlyres/A6F...112_201213.pdf
      "Safety and security don't just happen, they are the result of collective consensus and public investment. We owe our children, the most vulnerable citizens in our society, a life free of violence and fear."
      -Nelson Mandela

      Comment


      • #18
        Re: British Columbia Influenza Surveillance Bulletin 2012-13 Weeks 13-15

        BRITISH COLUMBIA INFLUENZA SURVEILLANCE BULLETIN
        2012-13: Number 19, Weeks 13-15
        March 24 to April 13, 2013

        Low-level influenza activity in BC

        Summary

        In weeks 13-15 (March 24 to April 13, 2013), influenza activity in BC remained low. The proportion of medical visits with an influenza diagnosis was below the 10-year median throughout the province. The proportion of patients with influenza-like illness (ILI) among those presenting to sentinel physicians was below or within the expected range for this time of year. BC Children?s Hospital Emergence Room also reported declining ILI consultations. Although the influenza positive rate increased slightly in weeks 14 and 15, still less than a quarter of the specimens tested at the provincial laboratory during this period were positive for influenza, predominantly influenza B and from the BC Children and Women?s Centre, few influenza viruses were detected. Two lab-confirmed influenza B outbreaks were reported from long-term care facilities in FHA (1) and IHA (1), and one lab-confirmed influenza A/H3N2 LTCF outbreak was reported from IHA during this period.
        ...
        Laboratory Reports

        As reported by the BC Public Health Microbiology & Reference Laboratory, PHSA, for weeks 13-15, 396 specimens were tested for influenza. Among them, 48 (12.1%, 48/396) were positive, including 36 (75%, 36/48) influenza B from all health authorities, and 12 (25%, 12/48) influenza A [5 A/H3N2, 6 A(H1N1)pdm09, 1 un-subtyped] from Vancouver Coastal, Fraser, and Interior Health Authorities. The proportion of influenza positives increased during this period although overall testing volumes continued to decline. Other respiratory viruses were sporadically detected.
        ...
        ILI Outbreaks

        In weeks 13-15, four outbreaks were reported from long-term care facilities (LTCF) including 2 lab-confirmed influenza B [1 FHA in week 15, 1 IHA in week 14], 1 lab-confirmed influenza A/H3N2 from IHA in week 13, and one RSV from FHA in week 14. At the beginning of week 16, two LTCF outbreaks from FHA and IHA and 2 school outbreaks from NHA have been reported (lab result pending). To date, a total of 89 lab-confirmed influenza LTCF outbreaks have been reported in BC for the current season (since week 40, 30 September 2012): 37 in Fraser, 23 in Interior, 12 in Vancouver Coastal, 13 in Vancouver Island, and 4 in Northern Health Authority.
        ...
        Full report:
        http://www.bccdc.ca/NR/rdonlyres/0C258E09-E55E-44FD-8437-D41F7D8AF494/0/InfluBulletin_Number19_Weeks1315_201213.pdf
        "Safety and security don't just happen, they are the result of collective consensus and public investment. We owe our children, the most vulnerable citizens in our society, a life free of violence and fear."
        -Nelson Mandela

        Comment

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