1 Infektionsmedicinsk Klinik, Finsencentret, Rigshospitalet, The Capital Region of Denmark2 Klinisk Immunologisk Afdeling. Blodbanken og Vævstypelaboratoriet, Diagnostisk Center, Rigshospitalet, The Capital Region of Denmark3 Department of Intensive Care, Abdominal Centre, Rigshospitalet, The Capital Region of Denmark4 Klinisk Fysiologisk/Nuklearmedicinsk Afdeling, Bispebjerg and Frederiksberg Hospital, The Capital Region of Denmark
Non-serotype b strains of Haemophilus influenzae are extremely rare causes of acute bacterial meningitis in immunocompetent individuals. We report a case of acute bacterial meningitis in a 14-year-old boy, who was previously healthy and had been immunised against H influenzae serotype b (Hib). The causative pathogen was identified as H influenzae serotype f (Hif), and was successfully treated with ceftriaxone. An immunological evaluation revealed transient low levels of immunoglobulins but no apparent immunodeficiency was found 2 years after the clinical insult.