FW: Australian Influenza Surveillance Report no.11 2011

[Wishart, Michael]

________________________________________

Dear all,

Please find attached the Australian Influenza Surveillance Report no.11. 2011 for the period of 6 August to 19 August 2011.

Of note:
* Levels of influenza-like illness (ILI) in the community continued to increase through both sentinel general practitioner surveillance systems and ILI presentations to emergency departments.
* Notifications have decreased in Queensland, New South Wales and South Australia, but have continued to increase in all other states and territories. Nationally the number of notifications has decreased in recent weeks. Currently the weekly number of notifications in the ACT, New South Wales, Queensland and Tasmania remain above the peak frequency of notifications observed in 2010.
* During this reporting period there were 3,096 laboratory confirmed notifications of influenza, with Queensland reporting the highest number of notifications, followed by New South Wales and South Australia. Nationally, the majority of virus detections have been pandemic (H1N1) 2009, with co-circulation of influenza B.
* The majority of states and territories have predominately reported pandemic (H1N1) 2009, with co-circulation of influenza B, except in Tasmania where there is mostly influenza B, and in Western Australia where there is mostly pandemic (H1N1) 2009, some A/H3N2 and very little influenza B.
* As at 19 August 2011, there have been 16,990 confirmed cases of influenza reported to the National Notifiable Diseases Surveillance System (NNDSS) in 2011. Currently the weekly number of notifications being reported nationally is above the peak frequency experienced in previous years, except 2009.* The WHO Collaborating Centre have reported a recent cluster of influenza viruses showing resistance to oseltamivir, all have been the pandemic (H1N1) 2009 subtype.
* The WHO has reported that influenza activity in the temperate regions of the northern hemisphere remains low. Influenza transmission continues to occur in a few countries of the tropical region. After peaking in early June, influenza transmission in South Africa has declined to low levels. In New Zealand, rates of national ILI consultations have recently declined to below baseline activity levels and influenza type B is currently the predominant strain circulating.

A summary version of this report will shortly be available on the web at the following address:
http://www.health.gov.au/internet/main/publishing.nsf/Content/cda-surveil-ozflu-flucurr.htm

If you have any questions, comments or feedback please reply to flu@health.gov.au

Kind regards,

Influenza Surveillance Team
| Vaccine Preventable Diseases Surveillance | Health Protection & Surveillance Branch | Office of Health Protection | Department of Health and Ageing |

Please note that the Influenza Surveillance Team, of the Vaccine Preventable Diseases Surveillance Section has a group e-mail address which is flu@health.gov.au. While you can still email individual members of the team, this email address will ensure prompt responses and will avoid delays when individual staff members are absent.

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