Haemophilus influenzae type b unsuspected bacteremia

Area of Science:

• Pediatrics
• Infectious Diseases
• Microbiology

Background:

• Haemophilus influenzae type b (Hib) can cause serious infections.
• Understanding the clinical course of occult Hib bacteremia is important for timely intervention.

Purpose of the Study:

• To define the clinical features and natural history of unsuspected Haemophilus influenzae type b (Hib) bacteremia.
• To assess the risk of focal infectious complications in children with Hib bacteremia.

Main Methods:

• Retrospective review of 322 Hib infections at Children's Hospital, Boston.
• Analysis of 31 patients with Hib bacteremia and 19 with Hib antigenemia and sterile blood cultures.

Main Results:

• Bacteremic children were typically under two years old with high fevers and otitis media.
• 32% of bacteremic patients developed focal complications, including meningitis.
• Children with antigenemia and sterile blood cultures had fewer complications when treated empirically.

Conclusions:

• Occult Hib bacteremia poses a high risk for severe focal infections, especially meningitis.
• Parenteral antibiotic therapy should be strongly considered for suspected Hib bacteremia.
• Further evaluation of rapid antigen detection for high-risk patient identification is needed.