For all the people who still have trouble...
Here is how to do it easy:
Just click "go" a couple of times, after you made some points go to the virus edit section.
Make sure you UNCHECK EVERYTHING except "sneezing" and "human only" This way you will have a lethality of 0, infectivity of 1 and visibility of 1.
Then just keep hitting "GO" untill you've infected every country (beware: this takes a while!) Then simply buy all the rest of the stuff and watch humanity suffer...
This is not the fastest way, I'm aware of that. If you want to do it faster, figure it out for yourself (took me a while). This is just for the people who keep trying and keep failing... Not for people who are too lame to figure stuff out for themselves and still want a high score ^_^
Great game!!!