This report provides an update on influenza and other seasonal respiratory pathogen activity
for the week ending 31 March 2013. For this season, we will provide detailed influenza
update reports on a monthly basis with bulletin style weekly updates in the weeks in between.
This report contains summary epidemiological information on influenza-like illness (ILI), its
severity and impact in the community and secondary care settings, and estimates of vaccine
The GP consultation rate for influenza-like illness (ILI) has been calculated using the same method as in the season 2011/12. Please refer to the technical document for further information.
Clinical influenza activity decreased compared to the previous week and was below the threshold for normal seasonal activity overall. Virological influenza activity detected through the GP sentinel scheme remained stable compared to the previous week, virological activity detected through non-sentinel sources decreased slightly. Please note that the data for week 13 is provisional and must be interpreted with caution, due to reporting delays resulting from the reduced number of working days over the holiday period.
Five 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 112 influenza infections requiring ICU have been reported to HPS (54 A(H3), 13 A(H1N1)pdm09, 11 A (subtype unknown), 34 B), 32 of whom are known to have died.
Levels of non-influenza seasonal respiratory pathogens overall were in line with expected levels, with the exception of the levels of Human Metapneumovirus reports, which were slightly higher than at the same time last year.
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.