Figure 2. The proportion of influenza B from 74 localities against their longitudes (week 1 of 2010 to week 40 of 2015).

We use disks to represent individual countries. The size of the disk is proportional to square root of the total confirmations of influenza A and influenza B. Names of the top 34 countries used in the main analysis are in black and others in darkgrey. Countries are coloured according to their geographic region or sub-region.