WHO? Mycoplasma pneumoniae, Chlamydia pneumoniae, and Legionella pneumophila. Causal agents for Pneumonia (CAP).
WHY? They lack a cell wall and do not retain color with gram-staining; remain colorless. They are neither Gram-positive nor Gram-negative.
TREATMENT? With ceftriaxone plus a macrolide, or with a fluoroquinolone alone.
1. Blasi F. Atypical pathogens and respiratory tract infections. Eur Respir J. 2004 Jul;24(1):171-81.
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