Severity is the statistic represented by the yellow bar. The higher the Severity of a disease the more likely it will be detected by a government which may take action by starting research on a cure.
Once cure development has started a higher severity makes it more likely that countries will invest more funding into cure research. A higher Severity also makes the plague harder to cure therefore increments in Severity also tend to also increase the length of time it takes to successfully develop a cure. Higher Severity also increases the amount of DNA points gained from Red, Bio-hazard Bubbles and infected countries. Due to this, it is best to prioritise Severity next after Infectivity once the disease has been spotted, until Lethality becomes important later.
Plague types can also increase or decrease Severity. Parasite has a unique ability to reduce overall severity (Symbiosis 1 - 3). Bio-Weapon has unique abilities to raise (and lower) severity, and while most evolutions of the Neurax Worm tend to raise severity, there are symptoms that reduce the overall severity (Adrenergic Constriction and Anxiolytic Infusion). The mutations from Viruses can lead to massive increases in both severity and lethality if left unchecked.
- It is much like Pandemic's Visibility stat, except that bubbles don't exist in Pandemic.
- It is displayed as a yellow line on the Disease Graph, much like it is displayed as a yellow bar on the Symptoms menu.
- Severity also increases the amount of DNA Points you get from popping red bubbles.
- Severity exists in the Santa's Little Helper scenario, with the same function, but is instead called Happiness.