WOW, I love this game. I really love the spaceship in the background at 3500. I've gotten 15000 and I haven't seen any new stuff to show up. Has anyone else?
Just played through it and exterminated the whole population in around 240 days. I noticed some things...
1.)You not only have to infect all the countries, but infect them FAST. By the time day 100 came around I only had around 50% killed.
2.)Rodents do help. I have used rodent transmission with a pretty much invisible virus and I got Madagascar infected fairly quickly multiple times.
3.)How fast they develop a vaccine depends on the number of hospitals. Try to get them to shut down.
But I still can't figure out how to kill them quickly enough. I'm using lethal symptoms, but it still doesn't seem to work as well. That impossible badge is truly something to get.