One of the key methods to fight with disease is increase immunity. Immune population will not be affected by disease. Can be gained by natural way (getting sick and recover) or artificial way (vaccination).
Vaccine development provides two key elements, effectivity and side effects. In each development phase, vaccine is tested with an increased number of subjects and the player is able to obtain more precise effectiveness range and less common side effects. While player can choose without completing all testing phases, It may bring extra risking mortality rates and effectiveness rate.
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