Infectious Disease OutbreaksInfection

Legionella micdadei weakly acid fast gram negative bacterium

April 4, 2026Janira Navarro

Janira Navarro spotlights Legionella micdadei as a gram-negative organism that can stain weakly acid-fast, a diagnostic pitfall relevant in immunosuppressed pneumonia workups.

The only gram-negative bacterium that can stain weakly acid-fast?
Legionella micdadei
Pathogen known to cause pneumonia in immunosuppressed patients.
Janira Navarro
microbiologydiagnostic-pitfall

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