cdc statistics on how vaccinations have helped prevent diseases
1 The CDC has reported a 99% reduction in the incidence of bacterial meningitis caused by Haemophilus influenzae since the introduction of the vaccination against the disease in 1988. 2  Researchers estimate that a viable malaria vaccine could be ready for children in the developing world as early as 2015. The CDC has reported a 99% reduction in the incidence of bacterial meningitis caused by Haemophilus influenzae since the introduction of the vaccination against the disease in 1988. 2  Researchers estimate that a viable malaria vaccine could be ready for children in the developing world as early as 2015.