##' @param level The level at which the prevalence is calculated at
##' each time point in \code{tspan}. 1 (population prevalence):
##' calculates the proportion of the individuals (cases) in the
##' population. 2 (node prevalence): calculates the proportion of
##' nodes with at least one case. 3 (within-node prevalence):
##' calculates the proportion of cases within each node. Default
##' is \code{1}.
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