Observed attack rate based on endogenous and exogenous infection pressure. Attack rate (fraction of endogenous population infected) according to different assumptions about endogenous and exogenous infection pressure. In the left-hand panel, vaccination effect is incorporated, while in the right hand panel no vaccination is considered.
Hashemian et al. BMC Medical Informatics and Decision Making 2012 12:35 doi:10.1186/1472-6947-12-35