I'm here to talk about a few pandemic strategies. My favourite and best-working one is to sell the first symptom, and build up the transmissions and the resistances. Then, when it has spread everywhere, (or at least most places) buy all the most-killer symptoms. Doing that won me the game!
I always had the best luck with selling the first symptom as well in order to decrease notoriety. That being said, whether or not you can infect some of the islands, most notably Madagascar, all comes down to luck.
One would think a virus that does absolutely nothing wouldn't cause countries to shut down all contact and go into marshal law...but I didn't make the rules.