Flu Shot Shortage (25 player)

Flu Shot Shortage (10 player) is a dungeon & raids achievement earned for defeating Festergut while none of the players in your raid group ever had 3 stacks of Inoculated on 10-player mode.

Strategy
Gas Spores will appear three times before Pungent Blight is cast. To meet the requirements for the achievement, all raid members must only receive two stacks of Inoculated, not all three. Pungent Blight is survivable with only two stacks of Inoculated. Bringing back hp without anyone dying will be the hard part, as Gaseous Plague will return doing full damage right after Pungent Blight is cast.