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New Zealand Influenza Surveillance 2012

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  • #16
    Re: New Zealand Influenza Surveillance 2012

    INFLUENZA WEEKLY UPDATE
    2012/35: 27 August ? 2 September 2012

    Summary
    ? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
    (DHB) with a national consultation rate of 36.7 per 100 000 (137 ILI consultations).
    ? A total of 391 swabs were received from sentinel (30) and non-sentinel (361)
    surveillance.
    ? 113 viruses were identified: A(H3N2) (70) ) including four A/Perth/16/2009 (H3N2)-like
    viruses, A (Not subtyped) (24), B (15) including one B/Wisconsin/1/2010-like and
    A(H1N1)pdm09 (4).
    In week 35, ILI consultation rate has decreased below the baseline. The proportion of positive
    influenza samples has also decreased. Influenza A(H3N2) viruses remain the predominant
    virus in many regions. These viruses do not appear to demonstrate a major antigenic drift.

    INFLUENZA-LIKE ILLNESS SURVEILLANCE
    In the past week, a total of 137 consultations for ILI were reported from 79 general practices
    in 19 out of 20 DHBs. This gives a weekly consultation rate 36.7 of per 100 000 patient
    population, a decrease from 58.6 per 100 000 reported in week 34. Figure 1 shows the
    weekly national consultation rates for 2007?2012 to date.
    ...
    Twitter: @RonanKelly13
    The views expressed are mine alone and do not represent the views of my employer or any other person or organization.

    Comment


    • #17
      Re: New Zealand Influenza Surveillance 2012

      INFLUENZA WEEKLY UPDATE
      2012/36: 3 ? 9 September 2012

      Summary
      ? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
      (DHB) with a national consultation rate of 33.1 per 100 000 (123 ILI consultations).
      ? A total of 346 swabs were received from sentinel (32) and non-sentinel (314)
      surveillance.
      ? 80 viruses were identified: A (Not subtyped) (34), A(H3N2) (32) ) including two
      A/Perth/16/2009 (H3N2)-like viruses, B (Lineage not determined) (13), and
      A(H1N1)pdm09 (1).
      In week 36, ILI consultation rate has decreased below the baseline. The proportion of positive
      influenza samples has also decreased. Influenza A(H3N2) viruses remain the predominant
      virus in many regions. These viruses do not appear to demonstrate a major antigenic drift.

      INFLUENZA-LIKE ILLNESS SURVEILLANCE
      In the past week, a total of 123 consultations for ILI were reported from 79 general practices
      in 19 out of 20 DHBs. This gives a weekly consultation rate 33.1 of per 100 000 patient
      population, a decrease from 36.7 per 100 000 reported in week 35.
      ...
      Twitter: @RonanKelly13
      The views expressed are mine alone and do not represent the views of my employer or any other person or organization.

      Comment


      • #18
        Re: New Zealand Influenza Surveillance 2012

        INFLUENZA WEEKLY UPDATE
        2012/37: 10 ? 16 September 2012

        ...
        Summary
        ? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
        (DHB) with a national consultation rate of 34.2 per 100 000 (131 ILI consultations).
        ? A total of 305 swabs were received from sentinel (24) and non-sentinel (281)
        surveillance.
        ? 63 viruses were identified: A (Not subtyped) (28), A(H3N2) (13) ) including four
        A/Perth/16/2009 (H3N2)-like viruses, B (19) including one of B/Brisbane/60/2008-like
        (belonging to the B/Victoria lineage) and two B/Wisconsin/1/2010-like viruses
        (belonging to the B/Yamagata lineage), and A(H1N1)pdm09 (3).
        In week 37, ILI consultation rate has decreased below the baseline. The proportion of positive
        influenza samples has also decreased. Influenza A(H3N2) viruses remain the predominant
        virus in many regions. These viruses do not appear to demonstrate a major antigenic drift.

        INFLUENZA-LIKE ILLNESS SURVEILLANCE
        In the past week, a total of 131 consultations for ILI were reported from 81 general practices
        in 19 out of 20 DHBs. This gives a weekly consultation rate 34.2 of per 100 000 patient
        population, a slight increase from 32.6 per 100 000 reported in week 36.
        ...
        Twitter: @RonanKelly13
        The views expressed are mine alone and do not represent the views of my employer or any other person or organization.

        Comment


        • #19
          Re: New Zealand Influenza Surveillance 2012

          INFLUENZA WEEKLY UPDATE
          2012/38: 17 ? 23 September 2012

          ...
          Summary
          ? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
          (DHB) with a national consultation rate of 21.0 per 100 000 (80 ILI consultations).
          ? A total of 290 swabs were received from sentinel (8) and non-sentinel (282) surveillance.
          ? 46 viruses were identified: A (Not subtyped) (19), A(H3N2) (13), B (Lineage not
          determined) (12), and A(H1N1)pdm09 (2) including one A/California/7/2009 (H1N1)-
          like virus.
          In week 38, ILI consultation rate has decreased below the baseline. The proportion of positive
          influenza samples has also decreased. Influenza A(H3N2) viruses remain the predominant
          virus in many regions. These viruses do not appear to demonstrate a major antigenic drift.

          INFLUENZA-LIKE ILLNESS SURVEILLANCE
          In the past week, a total of 80 consultations for ILI were reported from 80 general practices in
          19 out of 20 DHBs. This gives a weekly consultation rate 21.0 of per 100 000 patient
          population, a decrease from 34.2 per 100 000 reported in week 37.
          ...
          Twitter: @RonanKelly13
          The views expressed are mine alone and do not represent the views of my employer or any other person or organization.

          Comment


          • #20
            Re: New Zealand Influenza Surveillance 2012

            INFLUENZA WEEKLY UPDATE
            2012/39: 24 ? 30 September 2012

            ...
            Summary
            ? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
            (DHB) with a national consultation rate of 12.7 per 100 000 (47 ILI consultations).
            ? A total of 293 swabs were received from sentinel (9) and non-sentinel (284) surveillance.
            ? 28 viruses were identified: B (15) including two B/Wisconsin/1/2010-like viruses
            (belonging to the B/Yamagata lineage), A(H3N2) (8) including one A/Perth/16/2009
            (H3N2)-like, A (Not subtyped) (4), and A(H1N1)pdm09 (1) virus.
            In week 39, ILI consultation rate has decreased below the baseline. The proportion of positive
            influenza samples has also decreased. Influenza A(H3N2) viruses remain the predominant
            virus in many regions. These viruses do not appear to demonstrate a major antigenic drift.

            INFLUENZA-LIKE ILLNESS SURVEILLANCE
            In the past week, a total of 47 consultations for ILI were reported from 79 general practices in
            19 out of 20 DHBs. This gives a weekly consultation rate 12.7 of per 100 000 patient
            population, a decrease from 20.8 per 100 000 reported in week 38.
            ...
            Twitter: @RonanKelly13
            The views expressed are mine alone and do not represent the views of my employer or any other person or organization.

            Comment


            • #21
              Re: New Zealand Influenza Surveillance 2012

              Influenza surveillance in New Zealand
              2012

              First published: 9 April 2013
              Revised: 17 April 2013

              Lopez, L. and Q.S. Huang, Influenza Surveillance in New Zealand 2012,
              2013, Institute of Environmental Science and Research Ltd (ESR): Wellington, New Zealand

              SUMMARY

              Influenza viruses frequently undergo antigenic changes and can cause substantial morbidity and mortality in a short space of time. National influenza surveillance in New Zealand is an essential public health component for assessing and implementing strategies to control influenza. Influenza surveillance in New Zealand monitors the incidence and distribution of influenza in the community, it assists with the early detection of influenza epidemics and identifies the predominant circulating strains. This report summarises the burden of disease in the community due to influenza, the circulating influenza virus strains, hospitalisations and immunisation coverage for 2012.

              During the 2012 winter season, 4090 consultations for influenza-like illness (ILI) were reported from a national sentinel network of 85 general practices. It is estimated that ILI resulting in a visit to a general practitioner affected over 48,186 New Zealanders (1.1% of total population) during the season, compared with an estimated 41,133 people in 2011 (0.9% of total population).

              Influenza activity peaked in August. Overall, ILI activity in 2012 was at a medium level compared with the 1997?2012 period. ILI consultation rates varied greatly among District Health Boards (DHBs), with the highest rates reported from Waitemata and South Canterbury DHBs.

              As a key component of the Southern Hemisphere Influenza and Vaccine Effectiveness Research and Surveillance (SHIVERS), SARI (Severe Acute Respiratory Infections) surveillance has been established and fully functioning since 30th April 2012. The SARI surveillance and NMDS coding recorded high hospitalisation rates for very young and elderly subpopulations. SARI surveillance and NMDS coding also recorded higher hospitalisation rates for Pacific Peoples and Māori than for those of Asian, European or Other ethnic groups.

              In 2012, a total of 2425 influenza viruses were detected. Of these, 87.4% were influenza A and 12.6% were influenza B. Of all the viruses typed and sub-typed (2130) during the season, the predominant strain was influenza A(H3N2) at 74.0%, 14.4% were influenza B, and 11.6% were A(H1N1)pdm09 strains. Antiviral susceptibility monitoring indicated that all influenza viruses tested (except two) were sensitive to oseltamivir. The first oseltamivir resistant influenza A(H1N1)pdm09 virus was detected from a 26 year old male who was hospitalised with an acute upper respiratory tract infection within seven days of returning to New Zealand from India. The second oseltamivir resistant influenza A(H1N1)pdm09 virus was detected from 7-month-old Samoan infant girl who was hospitalised with suspected pneumonia and had not travelled overseas prior to hospitalisation.

              No significant antigenic drift was detected for influenza A(H1N1)pdm09 viruses. A(H3N2) viruses have genetically and antigenically drifted away from the A/Perth/16/2009-like strain and were closely related to A/Victoria/361/2011-like strain. Two lineages of influenza B viruses (B/Victoria and B/Yamagata lineages) were co-circulating in 2012 with an increased proportion of B/Yamagata lineage viruses. The B/Yamagata lineage viruses were antigenically closely related to the B/Wisconsin/1/2010-like strain. As a result, A(H3N2) and B components were updated for the influenza vaccine for 2013.

              The recommended influenza vaccine formulation for New Zealand in 2013 is:
               A(H1N1) an A/California/7/2009 (H1N1)-like strain*
               A(H3N2) an A/Victoria/361/2011 (H3N2)-like strain
               B a B/Wisconsin/1/2010-like strain
              *Note: A/California/7/2009 is an influenza A(H1N1)pdm09 strain
              ...

              Twitter: @RonanKelly13
              The views expressed are mine alone and do not represent the views of my employer or any other person or organization.

              Comment

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