Invasive Haemophilus influenzae Disease in Adults ≥65 Years, United States,…

Background. Since the introduction of the Haemophilus influenzae serotype b vaccine, H influenzae epidemiology has shifted. In the United States, the largest burden of disease is now in adults aged ≥65 years. However, few data exist on risk factors for disease severity and outcome in this age group. Methods. A retrospective case-series review of invasive H influenzae infections in pat…