Mean differences^* in absolute incidence numbers between the current situation and the situation with adolescent pertussis booster vaccination over a 25 year period for a population of 150,000 people (percentage reductions between brackets).

Rn = loss of immunity after natural infection. I1 = primary infection, I2 = recidive infection and I3 = asymptomatic infection. ≈0 refers to the situation where: −1.00 Negative numbers indicate an increase in incidence numbers as a result of adolescent vaccination. *Due to the extensive running time of the model―related to the high complexity―only 20 runs per scenario were performed. **No I1 exists anymore beyond 50 years of age.