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. 2011 Jun 8;6(6):e20577. doi: 10.1371/journal.pone.0020577

Table 1. The fraction and the payoff for the four types of individuals in the population.

Vaccinated & Healthy Vaccinated & Infected Unvaccinated & Healthy Unvaccinated & Infected
Fraction Inline graphic Inline graphic Inline graphic Inline graphic
Payoff Inline graphic Inline graphic Inline graphic Inline graphic

They are the vaccinated and healthy, the unvaccinated and healthy, the vaccinated and infected and the unvaccinated and infected.