Tatsur0 on steam wrote an amazing guide here:
http://steamcommunity.com/sharedfiles/filedetails/?id=288790...And while I am going to summarize his work, I wish to ensure he gets full credit. If all you need to win is the summary I am offering, great! Just ensure to drop by and give him a thumbs up.
The starting Genetic Code will be ATP Boost, Genetic Mimic, Aquacyte, Urbophile and Sympto-Stasis. You will choose to being in Saudi Arabia.
Step 1 - Abilities: Viral Instability 1, 2 and 3
Step 2 - Transmission: Water 1, Air 1 and Water 2
Step 3 - Abilities: Cold Resistance 1 and 2, Drug Resistance 1 and 2 then Heat Resistance 1
Step 4 - Transmission: Air 2, Extreme Bio-Aerosol, Rodent 1 and Bird 1
Step 5 - Symptoms: Necrosis, Dysentery, Total Organ Failure and if for some reason they are not dropping like flies just keep adding deadly symptoms.
I do hope this awesome guide helps. I can confirm it works, just remember that the randomized world events may not yield the win on the first try.
Please ensure to give the actual author, not summarizer, the credit!!!!! If you have any tips please let me know in the comments.