Lethality is a plague statistic that dictates how deadly the plague is. The more deadly a plague is, the more effort people will put into developing a Cure for it.
At the beginning of a game, lethality is not in any disease unless a deadly symptom like Total Organ Failure, Necrosis, Hemorrhagic Shock or Coma is added. Bio-Weapons will also slowly begin to generate toxins, gradually increasing their lethality unless suppressive abilities are evolved.
- It is similar to the Deadliness statistic in the Pandemic flash game.
- When increasing lethality, the models that represent the player's plague will begin to animate more.
- Lethality is completely absent in the Santa's Little Helper scenario, being replaced, instead, by Happiness.