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Re: Australia Influenza Surveillance 2011.
AUSTRALIAN INFLUENZA SURVEILLANCE REPORT
No. 15, 2011, REPORTING PERIOD:
1 October to 14 October 2011
...
Summary
? Across all surveillance systems, influenza activity this fortnight has continued to decrease.
? Levels of influenza-like illness (ILI) activity at the community level during 2011 were consistent with previous seasons, excluding 2009.
? During the 2010/11 inter-seasonal period, all jurisdictions reported higher than usual numbers of notifications, especially in the Northern Territory and Queensland. The reason for this unusually high activity is not clear, but do not appear to be due solely to increased testing. During this period, most of the influenza activity was attributed to pandemic (H1N1) 2009 and A(H3N2) infections.
? The main 2011 winter season, commenced and peaked earlier than in previous years and nationally, the majority of virus detections were pandemic (H1N1) 2009, with co-circulation of influenza B. The timing of influenza activity peaks and the distribution of influenza subtypes varied across states and territories.
? At the beginning of the winter season there was a high proportion of influenza B reported, mostly from South Australia, and very little A(H3N2). In recent weeks the proportion of A(H3N2) has continued to increase, with notifications mostly reported from Queensland, Western Australia and the Northern Territory.
? As at 16 October 2011, there have been 25,092 confirmed cases of influenza reported to the National Notifiable Diseases Surveillance System (NNDSS) in 2011. Nationally, weekly notifications for this season peaked in the week ending 5 August 2011 with 1,989 influenza notifications.
? Whilst the peak in notifications was above the peak frequency experienced in previous years, except 2009, assessment of this peak in conjunction with other surveillance systems monitored highlights that this difference in activity was not significant.
? During the season around 84% of influenza related hospitalisations were associated with pandemic (H1N1) 2009 (42%) or influenza A(untyped) (42%). Thirteen per cent of persons hospitalised with influenza were admitted to ICU.
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FluTracking
FluTracking, a national online system for collecting data on ILI in the community, noted that in the week ending 16 October 2011 fever and cough was reported by 2.3% of vaccinated participants and 2.4% of unvaccinated participants (Figure 4).4 Fever, cough and absence from normal duties was reported by 1.1% of vaccinated participants and 1.3% of unvaccinated participants. Rates of ILI among FluTracking participants have remained relatively stable this season, compared to previous years (Figure 5).
Up to 16 October 2011, 5,654 out of 10,151 (55.7%) participants reported having received the seasonal vaccine so far. Of the 2,320 participants who identified as working face-to-face with patients, 1,692 (72.9%) have received the vaccine.
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Of the 979 influenza notifications reported to the NNDSS this reporting period, 376 were influenza A (575 were influenza A (untyped), 141 were A(H3N2) and 79 were pandemic (H1N1) 2009), 175 were influenza B, 9 notifications were reported as untyped (Figure 10).
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Deaths associated with influenza and pneumonia
Nationally Notified Influenza Associated Deaths
In 2011, 14 influenza associated deaths have been notified to the NNDSS, with a median age of 47 years. Ten of these cases were reported as having a pandemic (H1N1) 2009 infection, two with influenza type B and the other case reported as having influenza type A (untyped).
New South Wales Influenza and Pneumonia Death Registrations
Death registration data up to 16 September 2011 showed that there were 1.5 pneumonia or influenza associated deaths per 100,000 population in NSW, which is below the seasonal threshold of 1.7 per 100,000 NSW population for this period (Figure 13).3
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http://www.health.gov.au/internet/main/publishing.nsf/Content/cda-ozflu-no15-11.htm/$file/ozflu-no15-2011.pdf
AUSTRALIAN INFLUENZA SURVEILLANCE REPORT
No. 15, 2011, REPORTING PERIOD:
1 October to 14 October 2011
...
Summary
? Across all surveillance systems, influenza activity this fortnight has continued to decrease.
? Levels of influenza-like illness (ILI) activity at the community level during 2011 were consistent with previous seasons, excluding 2009.
? During the 2010/11 inter-seasonal period, all jurisdictions reported higher than usual numbers of notifications, especially in the Northern Territory and Queensland. The reason for this unusually high activity is not clear, but do not appear to be due solely to increased testing. During this period, most of the influenza activity was attributed to pandemic (H1N1) 2009 and A(H3N2) infections.
? The main 2011 winter season, commenced and peaked earlier than in previous years and nationally, the majority of virus detections were pandemic (H1N1) 2009, with co-circulation of influenza B. The timing of influenza activity peaks and the distribution of influenza subtypes varied across states and territories.
? At the beginning of the winter season there was a high proportion of influenza B reported, mostly from South Australia, and very little A(H3N2). In recent weeks the proportion of A(H3N2) has continued to increase, with notifications mostly reported from Queensland, Western Australia and the Northern Territory.
? As at 16 October 2011, there have been 25,092 confirmed cases of influenza reported to the National Notifiable Diseases Surveillance System (NNDSS) in 2011. Nationally, weekly notifications for this season peaked in the week ending 5 August 2011 with 1,989 influenza notifications.
? Whilst the peak in notifications was above the peak frequency experienced in previous years, except 2009, assessment of this peak in conjunction with other surveillance systems monitored highlights that this difference in activity was not significant.
? During the season around 84% of influenza related hospitalisations were associated with pandemic (H1N1) 2009 (42%) or influenza A(untyped) (42%). Thirteen per cent of persons hospitalised with influenza were admitted to ICU.
...
FluTracking
FluTracking, a national online system for collecting data on ILI in the community, noted that in the week ending 16 October 2011 fever and cough was reported by 2.3% of vaccinated participants and 2.4% of unvaccinated participants (Figure 4).4 Fever, cough and absence from normal duties was reported by 1.1% of vaccinated participants and 1.3% of unvaccinated participants. Rates of ILI among FluTracking participants have remained relatively stable this season, compared to previous years (Figure 5).
Up to 16 October 2011, 5,654 out of 10,151 (55.7%) participants reported having received the seasonal vaccine so far. Of the 2,320 participants who identified as working face-to-face with patients, 1,692 (72.9%) have received the vaccine.
...
Of the 979 influenza notifications reported to the NNDSS this reporting period, 376 were influenza A (575 were influenza A (untyped), 141 were A(H3N2) and 79 were pandemic (H1N1) 2009), 175 were influenza B, 9 notifications were reported as untyped (Figure 10).
...
Deaths associated with influenza and pneumonia
Nationally Notified Influenza Associated Deaths
In 2011, 14 influenza associated deaths have been notified to the NNDSS, with a median age of 47 years. Ten of these cases were reported as having a pandemic (H1N1) 2009 infection, two with influenza type B and the other case reported as having influenza type A (untyped).
New South Wales Influenza and Pneumonia Death Registrations
Death registration data up to 16 September 2011 showed that there were 1.5 pneumonia or influenza associated deaths per 100,000 population in NSW, which is below the seasonal threshold of 1.7 per 100,000 NSW population for this period (Figure 13).3
...
http://www.health.gov.au/internet/main/publishing.nsf/Content/cda-ozflu-no15-11.htm/$file/ozflu-no15-2011.pdf
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