where L 0 and I 0 are the number of cells latently infected and infectious, respectively, at the start of the experiment, f L (t) is the probability density function for the latent infection period and P I (t) is the probability that a cell remains infectious for at least a time t after the latent-infectious transition. If a Dirac delta function is used for f L (t) and a Heaviside step function for 1{P I (t), then the infectious cell dynamics of Equation (2) are recovered. In the fits to the single-cycle data (Figure 7 ), f L (t) was taken to be normal (truncated at t~0 and renormalized) with parameters t L and s L ; the function P I (t) was also derived from a normal distribution f I (t)