This is the seventh monthly report of the 2012/13 influenza season. Please note that this is the last monthly influenza update report. For the remainder of the season we will publish bulletin style weekly updates unless there are significant changes in influenza activity which would require more detailed reporting.
This report contains summary epidemiological information on influenza-like illness (ILI) and acute respiratory illness (ARI) activity, its severity and impact in the community and secondary care settings, and estimation of vaccine uptake.
The GP consultation rate for influenza-like illness (ILI) has been calculated using the same method as in season 2011/12. Please refer to the technical document for further information.
In the last month, clinical influenza activity decreased until week 13, and was largely stable over the last two weeks, remaining below the threshold for normal seasonal activity overall. Virological influenza activity detected through the GP sentinel and non-sentinel sources fluctuated slightly but showed a decreasing trend overall.
Two influenza cases with severe infection requiring management in an intensive care unit (ICU) were reported to HPS in the last week. Since week 40 2012, a total of 122 influenza infections requiring ICU have been reported to HPS (58 A(H3), 17 A(H1N1)pdm09, 12 A (subtype unknown), 35 B). Thirty-five individuals were known to have died.
Levels of non-influenza seasonal respiratory pathogens overall were in line with expected levels over the last four weeks, with the exception of the level of parainfluenza virus which were slightly higher than at the same time last year. Levels of Human Metapneumovirus and rhinovirus were raised in previous weeks but decreased to within expected levels for week 15.
There is continuing evidence of significant community circulation of influenza. A CMO letter recommending that antivirals can be used in primary care where clinically appropriate was issued on the 20 December and can be accessed at: http://www.sehd.scot.nhs.uk/cmo/CMO(2012)10.pdf.