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Elementary constructs for incubation period (conventional time A to time B), latent period (time D to time B), and infectivity (typically time D to time E, but potentially to time F for prolonged asymptomatic excretion). [A = point or interval of exposure; B = symptomatic period begins for those who develop symptomatic disease; C = symptomatic period largely resolved; D = start of infectious excretion; E = end of infectious excretion; F = end of asymptomatic excretion].
