Fig 8 -

Two epidemic trajectories of an SEIR-type Safe Blues strand with mean infection period 10 days (left), and 5 days (right). The remaining strand parameters are common to both strands. The ‘Exposed’ curve does not appear to be consistent with the ‘Infected’ curve. This happens because the average duration of exposure is only 12 hours and because the ‘Exposed’ curve plots the number of exposed individuals at a fixed time on each day. Thus, the plotted exposure counts represent only that subset of exposures that overlap the daily time at which they are counted.