Fig. 2From: Hepatitis a virus infection in Central-West Tunisia: an age structured model of transmission and vaccination impactConceptual diagram of Hepatitis A transmission and vaccination model. After infection, individual moves from the susceptible compartment (S) to the exposed compartment (E) and becomes infectious after a latent period. Asymptomatic individuals (As) can clear their infection and move to the recovered compartment (R). Symptomatic individuals (Sy) may clear their infection and develop a lifelong immunity (i.e. move to the recovered compartment (R)) or die (D). Upon vaccination, a fraction of susceptible individual (e) of ages a moves to the vaccinated compartment and becomes immuneBack to article page