Characteristics of Selected Pneumonias



Streptococcus pneumoniae (pneumococcus). Gram-positive diplococci. 

Haemophilus influenzae. Pleomorphic gram-negative coccobacilli. 

Staphylococcus aureus. Plump gram-positive cocci in clumps. 

Klebsiella pneumoniae. Plump gram-negative encapsulated rods. 

Escherichia coli. Gram-negative rods. 

Pseudomonas aeruginosa. Gram-negative rods. 

Anaerobes. Mixed flora. 

Mycoplasma pneumoniae. PMNs and monocytes; no bacteria. 

Legionella species. Few PMNs; no bacteria. 

Chlamydophila pneumoniae. Nonspecific. 

Moraxella catarrhalis. Gram-negative diplococci. 

Pneumocystis jirovecii. Nonspecific. 



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