2009 Influenza Sentinel Surveillance - ESR

[RiSi]

Hi

Is it possible to mark this as a Sticky?

Influenza weekly updates from ESR have started for the 2009 flu season. Now on the following link:

http://www.surv.esr.cri.nz/virology/influenza_weekly_update.php

[Sally Furniss]

Re: 2009 Influenza Sentinel Surveillance - ESR

Thank you RiSi, It is now a sticky

[Sally Furniss]

Re: 2009 Influenza Sentinel Surveillance - ESR

Influenza viruses

There are two parts to the influenza surveillance system in New Zealand, one is general practice (GP) sentinel surveillance and the other is laboratory-based surveillance.
(top)
Sentinel Surveillance

The sentinel surveillance system commenced in 1991 as part of the WHO (World Health Organisation) global programme for influenza surveillance. It is operated nationally by ESR and locally by surveillance co-ordinators within the public health service in each health district. The system operates during the 'influenza season', from May through September each year.

It is based on a network of voluntary sentinel GPs distributed on a population density basis of approximately 1 per 50,000. Sentinel General Practices carry out both disease and virological surveillance. Each sentinel practice records the daily number of consultations that fit a case definition for an influenza-like illness (ILI), along with the patient's age, on a standardised reporting sheet.

The influenza case definition is "an acute respiratory tract infection characterized by an abrupt onset of two of the following: fever, chills, headache and myalgia". This data is either collected by phone, or forwarded by fax each Friday. Consultation rates are calculated using the number of consultations as the numerator and the sum of the patient populations, reported by the participating practices, as the denominator.

The national level of ILI activity is described using a set of threshold values: a weekly rate of 50-249 consultations per 100,000 patient population is considered indicative of normal seasonal activity; 250-399 indicates higher than expected activity, and >= 400 indicates an epidemic level of disease.

Each sentinel practice also provides respiratory samples from the first patient seen with an ILI on Monday, Tuesday and Wednesday of each week, which are forwarded to four regional virus diagnostic laboratories at Auckland, Waikato, Christchurch and Dunedin hospital and ESR virology laboratory for virus isolation and identification.

Weekly consultation data, along with virus isolation data, are forwarded by local co-ordinators to ESR each Monday. Collated national data are presented in reports weekly, monthly and annually. (top)
Laboratory-based Surveillance

The year-round laboratory-based surveillance of influenza and other viruses, is carried out by the four regional laboratories and by the ESR virology laboratory. These laboratories report all virus diagnoses made, largely from hospital in-patients and outpatients, to ESR. These data are reported nationally in the ESR Virology Weekly Report.
(top)

http://www.surv.esr.cri.nz/public_health_surveillance/influenza.php

[kiwibird]

Re: 2009 Influenza Sentinel Surveillance - ESR

Why are there so many unsubtyped Type A virus samples showing in Canterbury?

[gsgs]

Re: 2009 Influenza Sentinel Surveillance - ESR

from:

http://www.surv.esr.cri.nz/virology/influenza_weekly_update.php

about 50% of flu in NZ is newflu

it adds to oldflu, at some point in some weeks they
should weaken each other


week 25 ends 27.June according to CDC
have they different weeks-enumeration in NZ ?
week 26 is not in the July-range in the picture
Can they really have week 26 already ?

[Sally Furniss]

Re: 2009 Influenza Sentinel Surveillance - ESR

27th June is the Saturday in week 26

[DazzaMc]

Re: 2009 Influenza Sentinel Surveillance - ESR

Hi

Is it possible to mark this as a Sticky?

Influenza weekly updates from ESR have started for the 2009 flu season. Now on the following link:

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

Thanks for these RiSi - very handy!

[kiwibird]

Re: 2009 Influenza Sentinel Surveillance - ESR

Week 27:

Most of novel influenza AH1N1 09 viruses reported globally are sensitive to oseltamivir with only 3 isolated cases reported from Denmark, Japan and Hong Kong showing oseltamivir resistance. During this winter season in New Zealand, a total of 16 novel influenza AH1N1 09 viruses were tested by either a phenotypic assay or a molecular assay and all 16 viruses were sensitive to oseltamivir.

[gsgs]

Re: 2009 Influenza Sentinel Surveillance - ESR

3 times the rate of previous seasons:
(NZ-week 27 ends 05.July)

[pflu]

Re: 2009 Influenza Sentinel Surveillance - ESR

Nice chart find!... 3 Times is crazy, I bet it goes higher.

[kiwibird]

Re: 2009 Influenza Sentinel Surveillance - ESR

Does anybody have an updated link for this? It doesn't seem to be available any more.

She says about 80% of people with flu in the week to 5 July had swine flu rather than seasonal flu.

Weekly influenza reports are compiled each winter for the Environmental Science & Research agency. Dr Huang says they are particularly important this year because of swine flu.

http://www.flutrackers.com/forum/showthread.php?t=115006

[Sally Furniss]

Re: 2009 Influenza Sentinel Surveillance - ESR

Merged threads

http://www.flutrackers.com/forum/showthread.php?p=263525

[kiwibird]

Re: 2009 Influenza Sentinel Surveillance - ESR

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 11"><meta name="Originator" content="Microsoft Word 11"><link rel="File-List" href="file:///C:%5CDOCUME%7E1%5CUser%5CLOCALS%7E1%5CTemp%5Cmsoht ml1%5C01%5Cclip_filelist.xml"><link rel="Edit-Time-Data" href="file:///C:%5CDOCUME%7E1%5CUser%5CLOCALS%7E1%5CTemp%5Cmsoht ml1%5C01%5Cclip_editdata.mso"><!--[if !mso]> <style> v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style> <![endif]--><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <wontGrowAutofit/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><style> <!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-AU;} p.MsoBodyText, li.MsoBodyText, div.MsoBodyText {margin:0cm; margin-bottom:.0001pt; mso-pagination:none; font-size:12.0pt; mso-bidi-font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;} @page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style> <![endif]--> One hundred and sixty-seven swabs were sent from the sentinel surveillance in the past week. Two hundred and ten swabs were received by the virology laboratories. Of these, 85 influenza viruses were identified: novel influenza AH1N1 09 virus (68), seasonal influenza A virus (13), and seasonal influenza AH1N1 virus (4). The distribution by health district is shown in Table 1.<o:p></o:p>
<o:p> </o:p>
Table 1: Influenza viruses from sentinel surveillance for week 27 by Health District<o:p></o:p>
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Data received from 4/5 virology laboratories.<o:p></o:p>
<o:p> </o:p>
The accumulative influenza viruses are shown in figure 4 for sentinel surveillance by health district from week 18 (27 April-3 May) to week 27 (5 July). A total of 194 influenza viruses were identified: novel influenza AH1N1 09 virus (94), seasonal influenza A virus (41), seasonal influenza AH1N1 virus (41), seasonal influenza AH3N2 virus (8), A/Brisbane/59/2007 (H1N1)-like virus (7), influenza A (not sub-typed) (2), and B (not typed) (1).


ESR site is down - but I have contacted them and they have emailed me a copy of the full stats. PM me if you would like more info posted.

[gsgs]

Re: 2009 Influenza Sentinel Surveillance - ESR

[gsgs]

Re: 2009 Influenza Sentinel Surveillance - ESR

compare with the 2004 influenza (Fujian-H3N2) epidemic in the UK
nz27c2-attachment

that suggests a peak in week 28 or 29 and then a sharp decline



--------edit-----------
hmm, the thresholds were revised, this graph looks quite
different:

http://www.hpa.org.uk/web/HPAwebFile/HPAweb_C/1194947381241

not much increase in 2004/2005 in UK in that graph

-----------edit-------------
OTOH compare with NZ-2003 , 4 weeks increase and then it went down.
So next week could be already going down ...

nz2003-attachment