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New Zealand Influenza Surveillance 2015

Ronan Kelly

Ronan Kelly

Retired 2020
Link to 2014 thread: https://flutrackers.com/forum/forum...64734-new-zealand-influenza-surveillance-2014

Link to PHS Archive: https://surv.esr.cri.nz/virology/influenza_weekly_update.php

2015/20: 11 ? 17 May 2015

Summary
 ILI through sentinel surveillance was reported from 17 out of 20 District Health Boards (DHB) with a national consultation rate of 15.4 per 100 000 (46 ILI consultations).
 A total of 251 swabs were received from sentinel (14) and non-sentinel (237) surveillance.
 Eight influenza viruses were identified: A(H3N2) (5), B (2) including one B/Brisbane/60/2008-like, and A (not sub-typed) (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE In the past week, a total of 46 consultations for influenza-like illness were reported from 57 general practices in 17 out of 20 DHBs. This gives a weekly consultation rate of 15.4 per 100,000 patient population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average epidemic curve in 2000? 2013 (excluding 2009). For more details on threshold definitions, see Appendix. The current rate of influenza-like illness is below the seasonal threshold
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201520.pdf
 
INFLUENZA WEEKLY UPDATE
2015/21: 18 ? 24 May 2015

Summary
 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 17.4 per 100 000 (54 ILI consultations).
 A total of 265 swabs were received from sentinel (19) and non-sentinel (246) surveillance.
 Eight influenza viruses were identified: B (5), A (not sub-typed) (2) and A(H1N1)pdm09 (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 54 consultations for influenza-like illness were reported from 60 general practices
in 18 out of 20 DHBs. This gives a weekly consultation rate of 17.4 per 100,000 patient population. Figure 1
shows the weekly national consultation rate for 2015 in comparison to the average epidemic curve in 2000?
2013 (excluding 2009). For more details on threshold definitions, see Appendix. The current rate of
influenza-like illness is below the seasonal threshold.

...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201521.pdf
 
INFLUENZA WEEKLY UPDATE
2015/22: 25 ? 31 May 2015

 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 16.9 per 100 000 (55 ILI consultations).
 A total of 290 swabs were received from sentinel (7) and non-sentinel (283) surveillance.
 Eleven influenza viruses were identified: A(H3N2) (5), B (4), and A (not sub-typed) (2).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 55 consultations for influenza-like illness were reported from 59 general practices
in 18 out of 20 DHBs. This gives a weekly consultation rate of 16.9 per 100,000 patient population. Figure 1
shows the weekly national consultation rate for 2015 in comparison to the average epidemic curve in 2000?
2013 (excluding 2009). For more details on threshold definitions, see Appendix. The current rate of
influenza-like illness is below the seasonal threshold.
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201522.pdf
 
INFLUENZA WEEKLY UPDATE
2015/23: 1 ? 7 June 2015

Summary
 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 18.4 per 100 000 (56 ILI consultations).
 A total of 366 swabs were received from sentinel (17) and non-sentinel (349) surveillance.
 Twenty-eight influenza viruses were identified: A (not sub-typed) (16), B (9), and A(H3N2) (3).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 56 consultations for influenza-like illness were reported from 59 general practices
in 18 out of 20 DHBs. This gives a weekly consultation rate of 18.4 per 100,000 patient population. Figure 1
shows the weekly national consultation rate for 2015 in comparison to the average epidemic curve in 2000?
2013 (excluding 2009). For more details on threshold definitions, see Appendix. The current rate of
influenza-like illness is below the seasonal threshold.
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201523.pdf
 
INFLUENZA WEEKLY UPDATE
2015/24: 8?14 June 2015

Summary
 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 16.5 per 100 000 (52 ILI consultations).
 A total of 364 swabs were received from sentinel (25) and non-sentinel (339) surveillance.
 Forty-four influenza viruses were identified: A (not sub-typed) (25), A(H3N2) (13) and B (not lineagetyped)
(6).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 52 consultations for influenza-like illness were reported from 61 general practices
in 18 out of 20 DHBs. This gives a weekly consultation rate of 16.5 per 100,000 patient population. Figure 1
shows the weekly national consultation rate for 2015 in comparison to the average epidemic curve in 2000?
2013 (excluding 2009). For more details on threshold definitions, see Appendix. The current rate of
influenza-like illness is below the seasonal threshold.
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201524.pdf
 
INFLUENZA WEEKLY UPDATE
2015/25: 15?21 June 2015

Summary
 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 21.9 per 100 000 (66 ILI consultations).
 A total of 443 swabs were received from sentinel (22) and non-sentinel (421) surveillance.
 Sixty-three influenza viruses were identified: A (not sub-typed) (35), B (18) including one
B/Massachusetts/2/2012-like (1), A(H3N2) (9) including one A/Texas/50/2012 (H3N2)-like, and A
A/California/7/2009 (H1N1)-like (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 66 consultations for influenza-like illness were reported from 57 general practices
in 18 out of 20 DHBs. This gives a weekly consultation rate of 21.9 per 100,000 patient population. Figure 1
shows the weekly national consultation rate for 2015 in comparison to the average epidemic curve in
2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The current rate of
influenza-like illness is below the seasonal threshold.
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201525.pdf
 
INFLUENZA WEEKLY UPDATE
2015/26: 22?28 June 2015

Summary
 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 25.5 per 100,000 (78 ILI consultations).
 A total of 442 swabs were received from sentinel (27) and non-sentinel (415) surveillance.
 Eighty-three influenza viruses were identified: B (26) including two B/Massachusetts/2/2002-like and
one B/Yamagata lineage, A(H3N2) (24), A(H1N1)pdm09 (3) including one A/California/7/2009
(H1N1)-like, and A (not sub-typed) (30).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 78 consultations for influenza-like illness were reported from 58 general practices
in 18 out of 20 DHBs. This gives a weekly consultation rate of 25.5 per 100,000 patient population. Figure 1
shows the weekly national consultation rate for 2015 in comparison to the average epidemic curve in
2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The current rate of
influenza-like illness is below the seasonal threshold.
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201526.pdf
 
INFLUENZA WEEKLY UPDATE
2015/27: 29 June ? 5 July 2015

Summary
 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 42.1 per 100,000 (136 ILI consultations).
 A total of 619 swabs were received from sentinel (46) and non-sentinel (573) surveillance.
 209 influenza viruses were identified: A(H3N2) (73), A (not sub-typed) (70), and B (66) including one
B/Phuket/3073/2013.

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 136 consultations for influenza-like illness were reported from 61 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 42.1 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
epidemic curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix.
The current rate of influenza-like illness is above the seasonal threshold.

NZ.png
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201527.pdf
 
INFLUENZA WEEKLY UPDATE
2015/28: 6?12 July 2015

Summary
 ILI through sentinel surveillance was reported from 17 out of 20 District Health Boards (DHB) with a
national consultation rate of 53.9 per 100,000 (168 ILI consultations).
 A total of 614 swabs were received from sentinel (47) and non-sentinel (567) surveillance.
 278 influenza viruses were identified: B/Yamagata lineage (10) including three B/Phuket/3073/2013-
like, B/Victoria lineage (3), and B (lineage not typed) (82), A(H3N2) (70), and A (not sub-typed) (113).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 168 consultations for influenza-like illness were reported from 56 general
practices in 17 out of 20 DHBs. This gives a weekly consultation rate of 53.9 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
epidemic curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix.
The current rate of influenza-like illness is above the seasonal threshold.

NZ.png
...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201528.pdf
 
INFLUENZA WEEKLY UPDATE
2015/29: 13?19 July 2015
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201529.pdf

Summary
 ILI through sentinel surveillance was reported from 17 out of 20 District Health Boards (DHB) with a
national consultation rate of 59.9 per 100,000 (184 ILI consultations).
 A total of 791 swabs were received from sentinel (54) and non-sentinel (737) surveillance.
 388 influenza viruses were identified: B (133) including two B/Phuket/3073/2013-like, A(H3N2) (83)
including three A/Switzerland/9715293/2013 (H3N2)-like, A(H1N1)pdm09 (2), and A (not sub-typed)
(170).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 184 consultations for influenza-like illness were reported from 55 general
practices in 17 out of 20 DHBs. This gives a weekly consultation rate of 59.9 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
epidemic curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix.
The current rate of influenza-like illness is above the seasonal threshold.

NZ.png
 
INFLUENZA WEEKLY UPDATE
2015/30: 20–26 July 2015

Summary
 ILI through sentinel surveillance was reported from 17 out of 20 District Health Boards (DHB) with a
national consultation rate of 102.0 per 100,000 (319 ILI consultations).
 A total of 939 swabs were received from sentinel (90) and non-sentinel (849) surveillance.
 441 influenza viruses were identified: B (not lineage-typed) (192, A (not sub-typed) (172) and A(H3N2)
(77).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 319 consultations for influenza-like illness were reported from 58 general
practices in 17 out of 20 DHBs. This gives a weekly consultation rate of 102.0 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
epidemic curve in 2000–2013 (excluding 2009). For more details on threshold definitions, see Appendix.
The current rate of influenza-like illness is above the seasonal threshold.
NZ.png

...
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201530.pdf
 
Last edited:
Three deaths attributed to influenza so far this year
Ruth Brown
rbrown@nzdoctor.co.nz
Friday 07 August 2015, 1:21PM
Related Stories

Seasonal flu incidence is tracking much higher than last year with two confirmed deaths in Auckland and one probable death in Canterbury.

In Auckland a four-year-old boy died after developing pneumonia. Influenza A was detected but no sub-type identified yet, director of the WHO National Influenza Centre, Sue Huang told New Zealand Doctor.

Also in Auckland, a 77-year-old woman with a chronic condition died and the A strain (H3N2) was identified. A 41-year-old Christchurch woman is also thought to have died after contracting influenza.
...
http://www.nzdoctor.co.nz/news/2015...attributed-to-influenza-so-far-this-year.aspx
 
INFLUENZA WEEKLY UPDATE
2015/31: 27 July?2 August 2015
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201531.pdf

Summary
 ILI through sentinel surveillance was reported from 18 out of 20 District Health Boards (DHB) with a
national consultation rate of 112.2 per 100,000 (345 ILI consultations).
 A total of 910 swabs were received from sentinel (93) and non-sentinel (817) surveillance.
 442 influenza viruses were identified: B (not lineage-typed) (193), A (not sub-typed) (191), A(H3N2)
(54), B/Yamagata lineage (3) including two B/Phuket/3073/2013-like, and A(H1N1)pdm09 (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 345 consultations for influenza-like illness were reported from 56 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 112.2 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
epidemic curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix.
The current rate of influenza-like illness is above the seasonal threshold.
...

NZ.png

Comment: I don't know why NZ decided to change the format of this graphic this week. Comparing to the "old" version in post #11, the moving alert threshold has now become constant at its previous maximum. Looking at last week's chart, the alert threshold for Week 31 was around 115 per 100,000, we might have just touched it this week. Now on this new version, we're not even close. Information management & manipulation at its best. - Ro
 
INFLUENZA WEEKLY UPDATE
2015/32: 3–9 August 2015
https://surv.esr.cri.nz/PDF_surveill...kRpt201532.pdf

Summary
 Influenza-like illness (ILI) through sentinel surveillance was reported from 18 out of 20 District Health
Boards (DHB) with a national consultation rate of 120.0 per 100,000 (396 ILI consultations).
 A total of 1069 swabs were received from sentinel (82) and non-sentinel (987) surveillance.
 507 influenza viruses were identified: B (not lineage-typed) (260), A (not sub-typed) (170), A(H3N2)
(74) including five A/Switzerland/9715293/2013 (H3N2)-like, B/Victoria lineage (2), and
B/Phuket/3073/2013-like (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 396 consultations for influenza-like illness were reported from 61 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 120.0 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
seasonal curve in 2000–2013 (excluding 2009). For more details on threshold definitions, see Appendix. The
current rate of influenza-like illness is above the seasonal threshold.
NZ.png

Comment: NZ continuing with its new flat alert threshold this week, which contradicts its own definition : "Alert threshold (defined as 90% upper confidence interval) indicated here is a level above which,varying by time of year, influenza activity is higher than most years" (emphasis added). Using the older version (see post 11 above for example), the alert threshold for week 32 was about 95/100,000 which has most certainly been exceeded this week. - Ro
 
Last edited:
INFLUENZA WEEKLY UPDATE
2015/33: 10?16 August 2015
https://surv.esr.cri.nz/PDF_surveill...kRpt201533.pdf

Summary  ILI through sentinel surveillance was reported from 17 out of 20 District Health Boards (DHB) with a national consultation rate of 59.9 per 100,000 (184 ILI consultations).  A total of 791 swabs were received from sentinel (54) and non-sentinel (737) surveillance.  388 influenza viruses were identified: B (133) including two B/Phuket/3073/2013-like, A(H3N2) (83) including three A/Switzerland/9715293/2013 (H3N2)-like, A(H1N1)pdm09 (2), and A (not sub-typed) (170).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 487 consultations for influenza-like illness were reported from 61 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 148.5 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
seasonal curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The
current rate of influenza-like illness is above the alert threshold. NZ.png



Comment: NZ continuing with its new flat alert threshold this week, which contradicts its own definition : "Alert threshold (defined as 90% upper confidence interval) indicated here is a level above which,varying by time of year, influenza activity is higher than most years" (emphasis added). Using the older version (see post 11 above for example), the alert threshold for week 33 was about 90/100,000 which has most certainly been exceeded this week. - Ro
 
INFLUENZA WEEKLY UPDATE
2015/34: 17?23 August 2015
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201534.pdf

Summary
 Influenza-like illness (ILI) through sentinel surveillance was reported from 18 out of 20 District Health
Boards (DHB) with a national consultation rate of 123.7 per 100,000 (415 ILI consultations).
 A total of 1094 swabs were received from sentinel (72) and non-sentinel (1022) surveillance.
 477 influenza viruses were identified: B (not lineage-typed) (253), A (not sub-typed) (136), A(H3N2)
(78), B/Victoria lineage (6), A(H1N1)pdm09 (3), and B/Yamagata lineage (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 415 consultations for influenza-like illness were reported from 63 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 123.7 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
seasonal curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The
current rate of influenza-like illness is below the alert threshold.


NZ.png

Comment: NZ continuing with its new flat alert threshold this week, which contradicts its own definition : "Alert threshold (defined as 90% upper confidence interval) indicated here is a level above which,varying by time of year, influenza activity is higher than most years" (emphasis added). Using the older version (see post 11 above for example), the alert threshold for week 34 was about 80/100,000 which has most certainly been exceeded this week. - Ro
 
INFLUENZA WEEKLY UPDATE
2015/35: 24?30 August 2015
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201535.pdf

Summary
 Influenza-like illness (ILI) through sentinel surveillance was reported from 18 out of 20 District Health
Boards (DHB) with a national consultation rate of 88.7 per 100,000 (290 ILI consultations).
 A total of 994 swabs were received from sentinel (68) and non-sentinel (926) surveillance.
 422 influenza viruses were identified: B (not lineage-typed) (243), A (not sub-typed) (85), A(H3N2) (84)
including one A/Switzerland/9715293/2013 (H3N2), B/Victoria lineage (7) including five
B/Brisbane/60/2008-like, and B/Yamagata lineage (3) including two B/Phuket/3073/2013.

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 290 consultations for influenza-like illness were reported from 60 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 88.7 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
seasonal curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The
current rate of influenza-like illness is below the alert threshold.

NZ.png

Comment: NZ continuing with its new flat alert threshold this week, which contradicts its own definition : "Alert threshold (defined as 90% upper confidence interval) indicated here is a level above which,varying by time of year, influenza activity is higher than most years" (emphasis added). Using the older version (see post 11 above for example), the alert threshold for week 35 was about 70/100,000 which has most certainly been exceeded this week. - Ro
 
INFLUENZA WEEKLY UPDATE
2015/36: 31 August?6 September 2015
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201536.pdf

Summary
 Influenza-like illness (ILI) through sentinel surveillance was reported from 18 out of 20 District Health
Boards (DHB) with a national consultation rate of 77.2 per 100,000 (244 ILI consultations).
 A total of 961 swabs were received from sentinel (64) and non-sentinel (897) surveillance.
 427 influenza viruses were identified: B (not lineage-typed) (282), A (not sub-typed) (74), A(H3N2) (59)
including one A/Switzerland/9715293/2013 (H3N2)-like, B/Victoria lineage (6) including five
B/Brisbane/60/2008-like, B/Phuket/3073/2013-like (5), and A/California/7/2009 (H1N1)-like (1).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 244 consultations for influenza-like illness were reported from 57 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 77.2 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
seasonal curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The
current rate of influenza-like illness is below the alert threshold.
...
NZ.png
...

Comment: NZ continuing with its new flat alert threshold this week, which contradicts its own definition : "Alert threshold (defined as 90% upper confidence interval) indicated here is a level above which,varying by time of year, influenza activity is higher than most years" (emphasis added). Using the older version (see post 11 above for example), the alert threshold for week 36 was about 65/100,000 which has most certainly been exceeded this week. - Ro
 
INFLUENZA WEEKLY UPDATE
2015/37: 7?13 September 2015
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201537.pdf

Summary
 Influenza-like illness (ILI) through sentinel surveillance was reported from 18 out of 20 District Health
Boards (DHB) with a national consultation rate of 48.4 per 100,000 (154 ILI consultations).
 A total of 903 swabs were received from sentinel (45) and non-sentinel (858) surveillance.
 288 influenza viruses were identified: B (not lineage-typed) (199), A (not sub-typed) (42), A(H3N2) (33)
including two A/Switzerland/9715293/2013 (H3N2)-like, B/Yamagata lineage (8) including one
B/Phuket/3073/2013-like, B/Victoria lineage (4) including two B/Brisbane/60/2008-like, and
A(H1N1)pdm09 (2) including one A/California/7/2009 (H1N1)-like.

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 154 consultations for influenza-like illness were reported from 58 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 48.4 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
seasonal curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The
current rate of influenza-like illness is below the alert threshold. (The alert threshold being used does not match the definition given, however the current level of ILI activity has fallen below the older threshold for Week 37 which was around 60/100,000 - Ro)
 
INFLUENZA WEEKLY UPDATE
2015/38: 14?20 September 2015
https://surv.esr.cri.nz/PDF_surveillance/Virology/FluWeekRpt/2015/FluWeekRpt201538.pdf

Summary
 Influenza-like illness (ILI) through sentinel surveillance was reported from 18 out of 20 District Health
Boards (DHB) with a national consultation rate of 41.8 per 100,000 (130 ILI consultations).
 A total of 790 swabs were received from sentinel (34) and non-sentinel (756) surveillance.
 304 influenza viruses were identified: B (not lineage-typed) (158), B/Victoria lineage (35) including nine
B/Brisbane/60/2008-like, B/Yamagata lineage (27) including 12 B/Phuket/3073/2013-like, A(H3N2)
(61) including one A/Switzerland/9715293/2013 (H3N2)-like, and A (not sub-typed) (23).

INFLUENZA-LIKE ILLNESS SURVEILLANCE
In the past week, a total of 130 consultations for influenza-like illness were reported from 56 general
practices in 18 out of 20 DHBs. This gives a weekly consultation rate of 41.8 per 100,000 patient
population. Figure 1 shows the weekly national consultation rate for 2015 in comparison to the average
seasonal curve in 2000?2013 (excluding 2009). For more details on threshold definitions, see Appendix. The
current rate of influenza-like illness is below the alert threshold.
...

Comment: (The alert threshold being used does not match the definition given, however the current level of ILI activity is below the older threshold for Week 38 which was around 55/100,000 - Ro)
 
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