Quoted:
PS -Anyone that scores over about 140k on this game is cheating.
NO
There are two strategies.
You can try to kill every last person by going with a parasite:
START: Sell all symptoms, buy rodent borne (all transmissions and level 1 resistances if you are impatient)
Wait 30 minutes until all countries infected (if impatient wait the 5 or 10 minutes) and your points to build up.
When every country is infected, start adding symptoms and up moisture to level II.
If they notice you and start shutting down, buy all transmission, up resistances to level II (except drug), start buying infection traits (sneezing, sores, etc) then buy kill traits (hypersensitivity, kidney failure)
If a vaccine starts and you are already in symptom buying mode, DON'T BUY DRUG RESISTANCE. Just buy enough symptoms to make everyone sick and die. The hospitals will all shut down before the vaccine is completed.
Unless you elect to be super patient, Madagascar will still probably get away. Whatever the case, it will take you 150-250 days and your final score will be 50K-100K usually around 80K.
My high score is 101K with this method.
KILL AS MANY AS POSSIBLY AS QUICKLY AS POSSIBLE WITH A VIRUS: Speed = Score
Start: Buy all transmission modes. Buy level 1 resistances. Buy coughing and/or sneezing if you don't have it.
Let it spread and wait until Madagascar shuts its port.
Buy level II resistances EXCEPT drug. (The hospitals are about to shut down)
If you need more regions infected, buy infection traits first. If you pretty much have all the regions you are going to get, go straight to lethal symptoms.
You'll get everyone except for Madagascar and maybe one or two other regions. You'll still kill 6 billion and you'll do it in about 60 days. Your score will be 150K-300K usually around 200K.
My high score is 234K with this method.