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DemonicA02c · (This post was last modified: 13-06-2015 04:54 AM by DemonicA02c.)

You didn't need to upgrade any symptoms, just upgrade some transmission and abilities. When a notification pops up that tells the world has no healthy people, then you start to upgrade these symptoms. If symptoms upgraded itself when some peoples are healthy, you need to devolve it unless AI starts the cure. It's also save DNA Points to upgrade to total organ failure. I used this strategy and it worked well, I passed all of the plague with this strategy, and finished the game at approximately 5 hours (including special ones also). You can start in India or China. But I prefer China. And plus you can upgrade Air and Water at transmission. Also birds. And some heat and cold resistance, and also drug resistance.