Which pathogens mostly commonly cause bacterial pneumonia?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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Although pneumonia may be caused by myriad pathogens, a limited number of agents are responsible for most cases, [3, 23, 24, 25] Most authors categorize bacterial pneumonias by their infectious agents, which include pneumococcal agents; Haemophilus influenzae; Klebsiella, Staphylococcus, and Legionella species; gram-negative organisms; and aspirated micro-organisms. Microaspiration of organisms that colonize the upper respiratory tract and mucosal surfaces is probably the most common mode of infection. Some agents, notably Staphylococcus species, may be spread hematogenously.

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