[Moraxella osloensis as pathogen in septicemia (author's transl)]

Area of Science:

• Medical microbiology
• Infectious diseases

Background:

• Septicemia is a serious bloodstream infection.
• Neisseria meningitidis is a common cause of bacterial meningitis and septicemia.
• Moraxella osloensis is a less common bacterium that can cause opportunistic infections.

Observation:

• A 4-year-old girl presented with symptoms suggestive of septicemia.
• Initial treatment with penicillins was administered.
• Moraxella osloensis was isolated from cerebrospinal fluid despite treatment, indicating potential antibiotic resistance.

Findings:

• The isolated Moraxella osloensis strain exhibited diminished susceptibility to penicillins.
• Delayed recovery in the patient was attributed to the antibiotic resistance of the bacterium.
• Symptoms caused by Moraxella osloensis septicemia were similar to, but milder than, those of Neisseria meningitidis.

Implications:

• Accurate laboratory identification distinguishing Moraxella from Neisseria is crucial for effective treatment.
• The potential for penicillin resistance in Moraxella strains necessitates careful antibiotic selection.
• Understanding the clinical presentation of Moraxella osloensis infections is important for pediatric infectious disease management.