What are the organism-specific virulence factors of Streptococcus pneumoniae and Pseudomonas aeruginosa in bacterial pneumonia?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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Answer

The following are examples of organism-specific virulence factors:

  • Streptococcus pneumoniae – Pneumolysin, a multifunctional virulence factor, is cytotoxic to respiratory epithelium and endothelium by disrupting pulmonary tissue barriers. This factor directly inhibits immune and inflammatory cells and activates complement, decreasing the clearance of the bacteria from the lung. [19]

  • Pseudomonas aeruginosa - Pili play important role in the attachment to host cells. A type III secretion system allows injection of toxins into host cells. [20]


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