I tried all tactics at least 10+ times. What worked from the 3d time was
1=sell all symptoms buy sneezing
2=buy lvl 1 resistances and all 4 drug resistances as soon as possible
3= Once 4 countries/starting one +3 more/ are infected SELL sneezing n wait all countries to be infected
4= buy sneezing, vomiting coughing, unlock next tire buy fever then unlock 3d tire, buy all sympotms from 2d tire then buy kidney sympotm from third tire and hypersensitivity
 "Pandemic 2"){kind=icon}