For infections for which the perceived risk of serious disease is steadily low, the perceived risk of
suffering some vaccine side effects might become the driving force of the vaccine demand. We investigate
the dynamics of SIR infections in homogeneously mixing populations where the vaccine uptake is a
decreasing function of the current (or past) incidence, or prevalence, of vaccine side effects. We define
an appropriate model where vaccine side-effects are modelled as functions of the age since vaccination.
It happens that the vaccine uptake follows its own dynamics independent of epidemiological
variables. We show the conditions under which the vaccine uptake lands on a globally stable
equilibrium, or steadily oscillates, and the implications of such behaviour for the dynamics of
epidemiological variables. We finally report some unexpected scenarios caused by trends in vaccine
side effects
