Outbreak of Haemophilus influenzae type b disease among fully vaccinated children in a day-care center.

Background: Two cases of invasive Haemophilus influenzae type b (Hib) infection were reported in immunized children in a day nursery within 1 week. Both cases were younger than 18 months of age, cared for in the same room. We aimed to characterize carriage of Hib and response to eradication therapy in this setting.