epimixr is an R package that uses social mixing matrices to conduct epidemiological analysis. It contains the functions adjust_immunity (to adjust population-level immunity by mixing patterns as described in Funk et al., 2019), project_immunity (to estimate immunity based on vaccination data by projecting forward from a given starting point of age-specific susceptibility) and epidemic_age_dist (to estimate the age distribution of an epidemic, see also the finalsize package which implements more functionality to perform the same task).