Silent but Deadly
The Silent but Deadly popup.


People are complaining about an awful smell that appears to suddenly appear out of nowhere!

Symptoms Needed

Corrupted Air
Night Wraith
Dark Infiltration

Achievement Earned

Silent but Deadly

Dark Night is a symptom combo exclusive to the Shadow Plague DLC. The player can get this combo by evolving Corrupted Air, Night Wraith and Dark Infiltration.

Symptom Combos in Plague Inc. and Plague Inc: Evolved.
AssassinBath TimeBlind GeniusBlood in the AirBoomerCarpe JugulumCranial DispersionDiscovery ChannelFly MagnetOn The Naughty ListOopsProfuse BleedingProjectile VomitingPublic DefecationRed Ape RedemptionRed RainRude AwakeningRunnerSpitterSwinefluSymptom CombosTankUltimate ChristmasVampire BatWalking ContradictionWalking DeadZombie Panic