Changing patterns of bacterial meningitis in Olmsted County, Minnesota, 1935-1970.

Adolescent Adult Bacteria/isolation & purification Bacterial Infections/epidemiology Child Child, Preschool Cross Infection/epidemiology Death Certificates Haemophilus influenzae Humans Infant Infant, Newborn Infant, Newborn, Diseases/epidemiology Medical Records Meningitis/diagnosis,epidemiology,etiology,mortality Meningitis, Haemophilus/epidemiology,mortality Meningitis, Pneumococcal/epidemiology,mortality Middle Aged Minnesota Neisseria meningitidis