Love the idea.
The game has a brilliant concept. If you make a second i'd love to see a few things like . . . .
Sub regions, as in if you click on a region it zooms in so you can see your spread throughout Africa, North America, ect. This would also likely open doors to regional panic in certain affected areas while in areas where your virus is less present you people would be less concerned. You could also make the population spread out more realistically within sub regions. Ultimately a world population of seven billion would be fun to destroy. You could also make certain regions more difficult to infect to reflect the medical technology of the region. So spreading into and through North America and Europe would be much more difficult then Asia or Africa.
Also the ability to evolve differently in various regions would be neat so you have to create two different virus strains. So if you've noticed you've spread to Asia from Africa you can kick up the lethality of the African strain while leaving the Asian form less deadly so people there don't panic.
Great game none the less, looking forward to your future efforts.