Current Report Summary
- Compared with the previous year, most jurisdictions reported higher than usual numbers of influenza notifications during the 2012/13 inter-seasonal period.
- The onset of the winter influenza season is usually marked by a distinct and sustained rise in influenza activity. Nationally, influenza activity has continued to remain relatively stable, suggesting that the influenza season has not yet commenced.
- As at 21 June 2013, there have been 4,422 laboratory confirmed cases of influenza reported. Currently the NNDSS is receiving around 200 notifications per week from jurisdictions. Compared with more recent years, it appears that the 2013 winter influenza season will be starting later.
- Nationally, whilst influenza A remains the predominant influenza virus type (60%), the proportion of influenza B notifications has continued to increase. During 2012 the season there were very few notifications of pandemic (H1N1) 2009. Whilst the majority of influenza A reports are unsubtyped, so far in 2013 more than 9% of overall notifications have been reported as pandemic (H1N1) 2009.
- There have been low numbers of influenza associated hospitalisations so far in 2013.
- The WHO has reported that influenza activity in the northern hemisphere temperate zones has continued to decrease to low levels. In the temperate countries of South America and South Africa, influenza activity has started to increase, consistent with their influenza seasonal trends.
- The United States have reported four cases of the influenza A(H3N2) variant virus that were associated with fair attendance and contact with swine. The virus detected is the same as the variant viruses detected during the 2012 multi-state outbreak, which was also associated with swine exposure at agricultural fairs.
- The WHO has reported that since 21 May 2013, no new human cases of influenza A(H7N9) have been reported.
- Australian Influenza Surveillance Report No.1, 2013 (PDF 962 KB)
- Australian Influenza Surveillance Report No.1, 2013 (Word 1267 KB)
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