During week 7, 19 of the 29 countries reporting indicated high/medium-intensity transmission and wide geographic spread of influenza. Eleven countries reported increasing trends, and ten countries reported decreasing trends, compared to thirteen countries reporting increasing trends and six reporting decreasing trends in the previous week (week 6).
Virological surveillance shows that the proportion of influenza-positive cases among sentinel specimens continues to be high (52%) but continued to decrease, as first observed in the previous week.
Since week 40/2012, an even distribution of influenza virus types has been observed, 50% each for type A and type B viruses. Among influenza A viruses, an increasing proportion of A(H1)pdm09 over A(H3) has been reported since week 52/2012.
On 8 February 2013, ECDC published its annual risk assessment for seasonal influenza 2012-2013 based on data up to week 03/2013.