Before revision: In the face of a pandemic , individuals may decide whether they take actions to mitigate the spread of the disease(cooperate) , or not (defect) , resulting in a 'disease dilemma' similar to the  prisoner's dilemma.
After revision: In the face of a pandemic , individuals may decide whether they take actions to mitigate the spread of disease , or not (defect) , resulting in a 'disease dilemma' similar to the prisoner's dilemma.