for me what i did is parasite then maxed out the drug, heat, cold and moisture resistance... then speed it up... check if you infected the whole world first....
for the start do not put anything in the symptoms or the rodents, insects, water and air borne...
just the resistance at 1st... when you infected everyone then bring up the heavy symptoms etc.
have fun :D
the problem is when even if you are winning and killed the other players they still win... plus someone quit and the guys was still there but they skipped my turn till i died (i had full life and armor when he quit) so i was a sitting duck... but its still 4/5