New Zealand Influenza Surveillance 2012

[Ronan Kelly]

Flu Reports archive: http://www.surv.esr.cri.nz/virology/...kly_update.php

Influenza Weekly Update 2012/24
11 ? 17 June 2012

The national influenza surveillance system in New Zealand is an essential public health component for assessing and implementing strategies to control influenza. This report summarises the data collected from sentinel general practice (GP) surveillance and nonsentinel surveillance for week 24 (11 ? 17 June 2012).

Summary
Influenza-like illness (ILI) through sentinel surveillance was reported from 19 out of 20 District Health Boards (DHB) with a national consultation rate of 18.0 per 100 000 (66 ILI consultations). Two hundred and fifty-five swabs were received from sentinel (26) and nonsentinel (229) surveillance. Twenty-three viruses were identified: A(H3N2) (10), A(H1N1)pdm09 (6), B (Lineage not determined) (3), A (Not subtyped) (3) and B/Wisconsin/1/2010-like (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 66 consultations for influenza-like illness were reported from 81 general practices in 19 out of 20 DHBs. This gives a weekly consultation rate of 18.0 per 100 000 patient population. Figure 1 shows the weekly national consultation rates for 2010, 2011 seasons, and 2012 to date. The current rate of influenza-like illness is below the baseline.
...

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE/25
2012/25: 18 ? 24 June 2012
...
Summary
Influenza-like illness (ILI) through sentinel surveillance was reported from 19 out of 20
District Health Boards (DHB) with a national consultation rate of 19.6 per 100 000 (76 ILI
consultations). Two hundred and fifty-six swabs were received from sentinel (23) and nonsentinel
(233) surveillance. Fifty viruses were identified: A(H3N2) (16), A (Not subtyped)
(11), B (Lineage not determined) (9), A(H1N1)pdm09 (8), A/Perth/16/2009 (H3N2)-like (4),
A/California/7/2009 (H1N1)-like (1), and B/Wisconsin/1/2010-like (1).
INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 76 consultations for influenza-like illness were reported from 83
general practices in 19 out of 20 DHBs. This gives a weekly consultation rate of 19.6 per
100 000 patient population. Figure 1 shows the weekly national consultation rates for 2010,
2011 seasons, and 2012 to date. The current rate of influenza-like illness is below the
baseline.
...

[gsgs]

Re: New Zealand Influenza Surveillance 2012

..........................................

[Sally Furniss]

Re: New Zealand Influenza Surveillance 2012

Influenza rates in Canterbury soar

Influenza rates in Canterbury have soared in the past week and are now above the national average.

The national average stands at about 20 cases per 100,000 people.

Last week, the Canterbury average jumped to 50 cases per 100,000.

http://www.stuff.co.nz/national/health/7219546/Influenza-rates-in-Canterbury-soar

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/26: 25 June ? 1 July 2012
...

Summary
Influenza-like illness (ILI) through sentinel surveillance was reported from 19 out of 20
District Health Boards (DHB) with a national consultation rate of 36.9 per 100 000 (131 ILI
consultations). Three hundred and eighty-three swabs were received from sentinel (38) and
non-sentinel (345) surveillance. Ninety-four viruses were identified: A(H3N2) (48), A (Not
subtyped) (21), A(H1N1)pdm09 (14), A/Perth/16/2009 (H3N2)-like (4), B (Lineage not
determined) (3), A/California/7/2009 (H1N1)-like (2), and B/Wisconsin/1/2010-like (2).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 131 consultations for influenza-like illness were reported from 80
general practices in 19 out of 20 DHBs. This gives a weekly consultation rate of 36.9 per
100 000 patient population. Figure 1 shows the weekly national consultation rates for 2010,
2011 seasons, and 2012 to date. The current rate of influenza-like illness is below the
baseline.
...

http://www.surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2012/FluWeekRpt201226.pdf

[Sally Furniss]

Re: New Zealand Influenza Surveillance 2012

Five patients with influenza are in Christchurch Hospital's intensive care unit and another 80 in isolation wards, as pressure rises on an already fragile health system.

Hospital admissions for winter-related illnesses have surged dramatically over recent weeks and medical centres around the city are also reporting a sharp rise in the number of patients arriving with flu symptoms.

http://www.starcanterbury.co.nz/news/flu-gathers-pace-across-city/1449187/

...

Christchurch Hospital has seen an influx of flu patients over the last fortnight and were treating 40 patients with confirmed influenza or symptoms. Five of those patients were in a critical condition on ventilators in the Intensive Care Unit.

http://www.stuff.co.nz/the-press/news/7279148/Sick-Cantabs-told-to-stay-home

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/27: 2 ? 8 July 2012

Summary
ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
(DHB) with a national consultation rate of 51.9 per 100 000 (193 ILI consultations). A total
of 609 swabs were received from sentinel (59) and non-sentinel (550) surveillance. Two
hundred and thirty-five influenza viruses were identified: A(H3N2) (167), A(H1N1)pdm09
(30), A (Not subtyped) (22), B (Lineage not determined) (12), and A/Perth/16/2009 (H3N2)-
like (4).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 193 consultations for ILI were reported from 80 general practices
in 19 out of 20 DHBs. This gives a weekly consultation rate of 51.9 per 100 000 patient
population. Figure 1 shows the weekly national consultation rates for 2010, 2011 seasons,
and 2012 to date. For the first time this year the current rate of ILI is above the baseline and
follows the same trend as in 2011.


...

http://www.surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2012/FluWeekRpt201227.pdf

[Sally Furniss]

Re: New Zealand Influenza Surveillance 2012

Canterbury influenza rates are soaring, with 52 people in isolation in Christchurch Hospital and five in intensive care.
This is well above the national average, with 67 people admitted to hospital in the region the past two weeks.
From July 1-8, most district health boards had fewer than 30 confirmed influenza cases. Canterbury had 155.

http://www.stuff.co.nz/national/health/7289124/Canterbury-flu-rate-4-times-average

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/28: 9 ? 15 July 2012

Summary
ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards (DHB) with a national consultation rate of 102.8 per 100 000 (399 ILI consultations). A total of 905 swabs were received from sentinel (79) and non-sentinel (826) surveillance. 331 viruses were identified: A(H3N2) (232), A (Not subtyped) (35), A(H1N1)pdm09 (31), B (Lineage not determined) (26), A/Perth/16/2009 (H3N2)-like (5) and B/Wisconsin/1/2010- like (2).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 399 consultations for ILI were reported from 84 general practices in 19 out of 20 DHBs. This gives a weekly consultation rate of 102.8 per 100 000 patient population. Figure 1 shows the weekly national consultation rates for 2010, 2011 seasons, and 2012 to date. This week?s ILI rate is double the rate reported in week 27 (51.9 per 100 000).

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/29: 16 ? 22 July 2012

Summary
 ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
(DHB) with a national consultation rate of 108.5 per 100 000 (404 ILI consultations).
 A total of 702 swabs were received from sentinel (96) and non-sentinel (606)
surveillance.
 241 viruses were identified: A(H3N2) (155) including one A/Perth/16/2009 (H3N2)-like
virus, A (Not subtyped) (33), A(H1N1)pdm09 (31) including one A/California/7/2009
(H1N1)-like virus, B (Lineage not determined) (19), B/Wisconsin/1/2010-like viruses
(belonging to the B/Yamagata lineage) (3).
Influenza activity continued to increase in week 29. Influenza A(H3N2) viruses remain the
predominant virus in many regions particularly in Canterbury DHB. These viruses do not
appear to demonstrate a major antigenic drift, nothing extraordinary.

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 404 consultations for ILI were reported from 83 general practices
in 19 out of 20 DHBs. This gives a weekly consultation rate of 108.5 per 100 000 patient
population. Figure 1 shows the weekly national consultation rates for 2010, 2011 seasons,
and 2012 to date. The ILI rate has increased slightly from 102.8 per 100 000 in week 28 to
108.5 per 100 000 in week 29.

...

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/30: 23?29 July 2012

Summary
? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
(DHB) with a national consultation rate of 125.2 per 100 000 (483 ILI consultations).
? A total of 556 swabs were received from sentinel (85) and non-sentinel (471)
surveillance.
? 256 viruses were identified: A(H3N2) (156) including five A/Perth/16/2009 (H3N2)-like
virus, A (Not subtyped) (59), A(H1N1)pdm09 (25) including two A/California/7/2009
(H1N1)-like, and B (Lineage not determined) (16).
Influenza activity continued to increase in week 30. Influenza A(H3N2) viruses remain the
predominant virus in many regions particularly in Canterbury DHB. These viruses do not
appear to demonstrate a major antigenic drift, nothing extraordinary.

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 483 consultations for ILI were reported from 82 general practices
in 19 out of 20 DHBs. This gives a weekly consultation rate of 125.2 per 100 000 patient
population, an increase from 108.5 per 100 000 reported in week 29. Figure 1 shows the
weekly national consultation rates for 2007?2012 to date.


...

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/31: 30 July ? 5 August 2012

Summary
? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
(DHB) with a national consultation rate of 154.1 per 100 000 (581 ILI consultations).
? A total of 566 swabs were received from sentinel (79) and non-sentinel (487)
surveillance.
? 238 viruses were identified: A(H3N2) (144) including one A/Perth/16/2009 (H3N2)-like
virus, A (Not subtyped) (61), A(H1N1)pdm09 (19), and B (14) including one
B/Brisbane/60/2008-like.
In week 31, influenza-like illness consultations continued to increase but the proportion of
positive influenza samples have 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 581 consultations for ILI were reported from 82 general practices
in 19 out of 20 DHBs. This gives a weekly consultation rate of 154.1 per 100 000 patient
population, an increase from 125.2 per 100 000 reported in week 30. Figure 1 shows the
weekly national consultation rates for 2007?2012 to date.


...

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/32: 6 ? 12 August 2012

Summary
? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
(DHB) with a national consultation rate of 109.2 per 100 000 (421 ILI consultations).
? A total of 513 swabs were received from sentinel (69) and non-sentinel (444)
surveillance.
? 166 viruses were identified: A(H3N2) (87), A (Not subtyped) (49), B (Lineage not
determined) (17), and A(H1N1)pdm09 (13) including one A/California/7/2009 (H1N1)-
like virus.
In week 32, ILI consultations and the proportion of positive influenza samples have both
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 421 consultations for ILI were reported from 83 general practices
in 19 out of 20 DHBs. This gives a weekly consultation rate of 109.2 per 100 000 patient
population, a decrease from 154.1 per 100 000 reported in week 31. Figure 1 shows the
weekly national consultation rates for 2007?2012 to date.

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/33: 13 ? 19 August 2012

Summary
? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
(DHB) with a national consultation rate of 85.5 per 100 000 (305 ILI consultations).
? A total of 538 swabs were received from sentinel (49) and non-sentinel (489)
surveillance.
? 196 viruses were identified: A(H3N2) (131) ) including 22 A/Perth/16/2009 (H3N2)-like
viruses, A (Not subtyped) (34), B (17) including one B/Brisbane/60/2008-like and one
B/Wisconsin/1/2010-like, and A(H1N1)pdm09 (14) including three A/California/7/2009
(H1N1)-like virus.
In week 33, ILI consultations have dropped and the proportion of positive influenza samples
has increased slightly. 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 305 consultations for ILI were reported from 80 general practices
in 19 out of 20 DHBs. This gives a weekly consultation rate of 85.5 per 100 000 patient
population, a decrease from 109.2 per 100 000 reported in week 32. Figure 1 shows the
weekly national consultation rates for 2007?2012 to date.

[Ronan Kelly]

Re: New Zealand Influenza Surveillance 2012

INFLUENZA WEEKLY UPDATE
2012/34: 20 ? 26 August 2012

Summary
? ILI through sentinel surveillance was reported from 19 out of 20 District Health Boards
(DHB) with a national consultation rate of 58.6 per 100 000 (203 ILI consultations).
? A total of 401 swabs were received from sentinel (48) and non-sentinel (353)
surveillance.
? 131 viruses were identified: A(H3N2) (59) ) including four A/Perth/16/2009 (H3N2)-like
viruses, A (Not subtyped) (47), B (18) including two B/Brisbane/60/2008-like and
A(H1N1)pdm09 (7).
In week 34, ILI consultations and the proportion of positive influenza samples have
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 203 consultations for ILI were reported from 77 general practices
in 19 out of 20 DHBs. This gives a weekly consultation rate of 58.6 per 100 000 patient
population, a decrease from 85.5 per 100 000 reported in week 33. Figure 1 shows the
weekly national consultation rates for 2007?2012 to date.
...