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Cases of Hib meningitis in the Greater Helsinki area (current population >1 million), 1939-2003. No reincrease in the incidence has been found since wide scale vaccination began in 1986. Hib=Haemophilus influenzae type b; Hif=H influenzae type f; Hi-NT=non-typable H influenzae. Three different Hib vaccines have been used over the years
