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Lung abscess caused by Legionella micdadei

K M Johnson¹, J S Huseby

¹Department of Medicine, University of Washington, Seattle, USA.

|January 1, 1997

Summary

A rare lung abscess caused by Legionella micdadei in an AIDS patient highlights diagnostic challenges. Successful treatment involved antibiotics and catheter drainage for this opportunistic infection.

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Area of Science:

Medical Microbiology
Infectious Diseases
Pulmonology

Background:

Legionella micdadei is an uncommon cause of pneumonia and lung abscess.
Immunocompromised individuals, such as those with Acquired Immunodeficiency Syndrome (AIDS), are at increased risk for opportunistic infections.
Accurate diagnosis of Legionella infections can be challenging due to specific laboratory requirements.

Observation:

A case of lung abscess is presented in a patient diagnosed with AIDS.
The causative agent was identified as Legionella micdadei, a bacterium known for its difficult-to-detect characteristics.
The organism exhibited weak Gram-negative staining and required specialized culture media for isolation.

Findings:

Legionella micdadei may be misidentified due to its staining properties, potentially being confused with mycobacteria (acid-fast).
Standard diagnostic tests for Legionella pneumophila may not detect Legionella micdadei.
The lung abscess in this patient was successfully treated with a combination of antibiotic therapy and percutaneous catheter drainage.

Implications:

This case underscores the importance of considering atypical pathogens in immunocompromised patients presenting with lung infections.
Awareness of Legionella micdadei's unique diagnostic features is crucial for timely and accurate identification.
Effective management strategies include antimicrobial treatment and source control through drainage.

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