Individual exposure probabilities and individual immune history plots from a simulation with two exposure types.

The left hand plot displays the probability of successful (immunity-boosting) exposure for a simulation with 120 time steps, two exposure events and 100 individuals. The right hand plot displays the immune histories for the same simulation. Exposure event one (top row) represents an infection event and exposure event two (bottom row) represents a vaccination event. NA indicates that an individual was not available to be exposed in that time period, usually because they were not yet born or entered the study population.