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Annual incidence of causative agents of bacterial meningitis per 100,000 and effect of Hib and PCV vaccinations in Turkey. Because our study centers provide service to 32% of the population of Turkey, extrapolation from the number of cases recorded was calculated for the possible number of acute bacterial meningitis cases (excluding neonatal cases) per year occur in the whole country. The population of children 1 mo through 18 y of age was calculated as 23.9 million.
