I used 34 regular monkeys with the piercing upgrade and 1 supermonkey for the last 3 levels placed right in the middle of them. Was it overkill? maybe, but better to be safe than sorry.
Salvetory, yes i get that....step 5 then says to wait until 3 countries are infected and sell sneezing...how do the rest get infected then if i sell my only symptom?
 "Bloons Tower Defense"){kind=icon}
 "Champions of chaos"){kind=icon}
 "The Adventures of Red"){kind=icon}
 "ClueSweeper"){kind=icon}
 "Pandemic 2"){kind=icon}