This figure shows the notification rate for laboratory confirmed influenza from 2008 to 2013 by 5-year age groups. This figure demonstrates that 2013 was characterised by co-circulation of A(H1N1)pdm09, A(H3N2) and influenza B viruses. Rates in 2013 were highest in the youngest age groups (0-9 years) but were also higher in the middle aged (35-44 years) age groups.