Table 3.

Summary of other notation.

quantity	interpretation
P	probability that an individual chooses to vaccinate pre-emptively (this defines the individual's strategy)
p	pre-outbreak vaccine coverage (proportion of the population vaccinated pre-emptively)
pg	the group optimum, i.e. the proportion of the population vaccinated pre-emptively which minimizes mortality
pi	the individual equilibrium, i.e. the level of pre-outbreak vaccine coverage which is the unique Nash equilibrium, as described in §3
C(p)	the mortality cost, i.e. the proportion of the population that is expected to die, given pre-emptive vaccine coverage p
	the critical lag, i.e. the response lag beyond which mortality is independent of vaccination effort (see §7.5.1)
	the effective critical lag, i.e. the response lag beyond which mortality is identical for all feasible values of vaccination effort (see §7.5.2)