Weekly influenza surveillance overview, 28 Nov – 4 Dec 2011 (week 48)

During week 48/2011, low influenza activity was notified by all 28 countries reporting.
Of 605 sentinel specimens tested, nine were positive for influenza viruses (1.5%). Of the 54 influenza virus detections in sentinel specimens since week 40/2011, 39 were type A and 15 were type B viruses. Of 28 influenza A viruses sub-typed, four were A(H1)pdm09 and 24 were A(H3) viruses.
Since week 40/2011, 61 SARI cases have been reported. Eighteen of them were confirmed influenza cases.
Nine weeks after the beginning of the surveillance season for influenza in the Northern Hemisphere, there has been no evidence of sustained transmission in EU/EAA countries.