Moraxella catarrhalis bacteremia: a 10-year experience

Area of Science:

• Pediatric Infectious Diseases
• Bacteriology
• Microbiology

Background:

• Moraxella catarrhalis is a common upper respiratory tract bacterium.
• It frequently causes acute otitis media and sinusitis in children.
• Invasive disease due to M. catarrhalis is uncommon.

Purpose of the Study:

• To investigate the clinical characteristics and outcomes of invasive Moraxella catarrhalis infections.
• To identify risk factors and common presentations of M. catarrhalis bacteremia in children.

Main Methods:

• Retrospective review of hospital records.
• Inclusion criteria: patients with positive blood cultures for M. catarrhalis.
• Study period: 10 years (1988-1997).

Main Results:

• Eleven cases of M. catarrhalis bacteremia identified in children aged 11-32 months.
• Common symptoms included fever and upper respiratory tract infections.
• Associated conditions: acute otitis media (10 cases), sinusitis (5 cases), pneumonia (3 cases).
• Risk factors present in 44% of patients (sickle cell disease, AIDS, leukopenia).
• All isolates were beta-lactamase producers.

Conclusions:

• Moraxella catarrhalis bacteremia should be considered in febrile young children with upper respiratory infections or acute otitis media.
• Increased vigilance is warranted in children with underlying immune dysfunction.
• Prompt diagnosis and appropriate antibiotic treatment are crucial.