Key points

In mainland France:

• Continued increase in all flu indicators

• All regions are experiencing an epidemic, with Corsica entering the epidemic phase in week 11

• Predominance of the A(H3N2) virus over A(H1N1)pdm09

• First data on influenza vaccine efficacy available, with an estimated 50% effectiveness against all influenza viruses, across all age groups

In the Overseas Territories:

• French Guiana: Decline in influenza indicators