Easy once you get the order of things.
Just click go till day 16 or 17 and use your pointas ro remove all the lethality effects eccept for sneezeing. then continue using your points in order to buy all the infectionability upgrades. once the entire planet is infected use all your points to add to the lethality and youve won. great game! i like it better than the other ones and the idea of being your own virus is great, it just needs more variety, like customize how it looks or how it infects people.