Haemophilus influenzae type b infections on Victoria, Australia, 1985 to 1987

Invasive Haemophilus influenzae type b (HIB) infections occurring from 1985 to 1987 in children younger than 16 years of age living in the state of Victoria were reviewed. Ther were 547 cases which fulfilled the case definition, including 231 cases of meningitis, 219 of epiglottitis and 97 other infections; 14 (2.6%) children died, 8 with meningitis, 5 with epiglottitis and 1 with pneumonia. Ninety-five percent of cases occurred in children younger than 5 years of age, in whom the case attach rate was 58.65/100000/annum. Nealy two-thirds of cases (46% of meningitis; 91% of epiglottitis; 45% of other infections) occurred in children more than 18 months of age (the age at which vaccine is presently given in the United Staes). Compared