Weekly influenza surveillance overview, week 6 2014

​For week 6/2014:
• Of the 27 countries providing clinical data, Greece reported high-intensity influenza activity, eight reported medium intensity and 19 countries reported low-intensity influenza activity.
• Of the 1 495 sentinel specimens tested across 27 countries, 495 (33%) were positive for influenza virus. Since week 40/2013, six countries have reported 1 941 hospitalised, laboratory-confirmed influenza cases, 1 920 (99%) of which were caused by influenza virus type A infection.

For the second consecutive week, the proportion of sentinel specimens testing positive for influenza virus has decreased and influenza activity appears to be declining in some countries. Influenza A(H1)pdm09 and A(H3) viruses are co-circulating in outpatient settings; however, A(H1)pdm09 is predominant in hospitalised cases.