1 Pick Virus.
2 Start in Canada, Greenland, New Zealand, or Cuba (if not, restart).
3 Sell starting symptoms (if any), other than sneezing. If you don’t have sneezing, buy it.
4 Buy 1-1-1-0 Resistances.
5 Once your disease spreads to about 10 countries, sell sneezing to get rid of visibility.
6 Wait until all countries are infected. If this is after day 30, restart.
7 Pump 4 Drug Resistance and buy sneezing, coughing, vomiting.
8 After a few days(at latest around 35), unlock tier 2-3 keeping whatever symptoms it gives you.
9 Buy fever, fatigue, diarrhea, pulmonary edema, hypersensitivity, hemorrhaging and whatever else you can afford that increases lethality.
10 Wait until everyone dies