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An increase in Haemophilus influenzae type B vaccination among preschool-aged children in inner-city Los Angeles, 1990 through 1992.

D P Ewert, S Westman, B Ward, N Bendaña, R Halbert, C M Vadheim, J I Ward and L Mascola

Acute Communicable Disease Control, Los Angeles County Department of Health Services.

Haemophilus influenzae type b (Hib) vaccination coverage and disease incidence were measured among preschool-aged children residing in inner-city Los Angeles. Among children 1.5 to 14 months of age, vaccination coverage of at least one dose increased from 0% in 1990 to 82% (95% confidence interval [CI] = 73%, 91%) in 1992. Among children 15 to 59 months old, vaccination coverage of at least one Hib dose administered at or after age 15 months increased from 35% (95% CI = 29%, 41%) in 1990 to 63% (95% CI = 56%, 70%) in 1992. Although Hib vaccination has reduced disease incidence in this population, greater use of vaccine can result in further reductions.