Fig. 2From: Modelling the effects of booster dose vaccination schedules and recommendations for public health immunization programs: the case of Haemophilus influenzae serotype bFraction of carriage (a,b) and symptomatic disease (c,d) in the population over a 30-year period of simulations following the start of vaccination. The coverage of primary series vaccination was fixed at 90%. The parameter q represents the fraction of infected individuals who experience carriage. Black curves represent the equilibrium state of the system prior to the start of vaccination, at which the disease remains endemic in the population. Red curves show the scenario in which only primary vaccination is offered to infants within 6Â months after birth. Blue curves represent the scenario in which primary vaccination of infants is combined with 100% coverage of the booster dose within 1Â year after the primary series. Green curves show the scenario in which primary vaccination of infants is combined with 100% coverage of the booster dose between 2 and 4Â years after the primary seriesBack to article page