loving madagascar gets me every time.
I finally got it by making a parasite that has no symptoms and spreads through water and insects after launching in greenland.
[edit]
The entire world is now infected and I have added fatigue, depression, insanity, and dementia to the effects.
Basically the parasite makes you so sad you kill yourself. Or something. I dunno.
Its working. Greenland just went out and all hospitals are now closed so it looks like I am going to win this one :D
[edit2] With the fall of western europe, china is the last country still alive with 38 people... for now. >:D
[edit3] K the human race was killed off within 335 days of this thing being created. Kinda depressing...