  In this work we consider a model of epidemic spreading coupled with an
opinion dynamics in a fully-connected population. Regarding the opinion
dynamics, the individuals may be in two distinct states, namely in favor or
against a vaccination campaign. Individuals against the vaccination follow a
standard SIS model, whereas the pro-vaccine individuals can also be in a third
compartment, namely Vaccinated. In addition, the opinions change according to
the majority-rule dynamics in groups with three individuals. We also consider
that the vaccine can give permanent or temporary immunization to the
individuals. By means of analytical calculations and computer simulations, we
show that the opinion dynamics can drastically affect the disease propagation,
and that the engagement of the pro-vaccine individuals can be crucial for
stopping the epidemic spreading. The full numerical code for simulate the model
is available from the authors' webpage.
