Figure 1.

A graphical representation of the two-state Markov model of seasonal influenza vaccination uptake and of the four kind of transitions

Abbreviation: SIV, seasonal influenza vaccination.^a: transition “SIV uptake to SIV uptake” (i.e., remaining vaccinated)^b: transition “no SIV uptake to no SIV uptake” (i.e., remaining unvaccinated)^c: transition “SIV uptake to no SIV uptake” (i.e., stopping vaccination)^d: transition “no SIV uptake to SIV uptake” (i.e., starting vaccination).