Pseudomonas aeruginosa is a gram negative rod. P
aeruginosa can resist high concentration of salt, dyes, weak antiseptics, and
many commonly used antibiotics. Most pseudomonads known to cause disease in
humans are associated with opportunistic infections. Pseudomonas aeruginosa and Pseudomonas
maltophila are mostly responsible for disease conditions.
 |
| Bioluminescence detected from a swarming colony
of Pseudomonas aeruginosa Copyright and Source: American Society of Microbiology |
This opportunistic pathogen may infect virtually any
tissue. Infection is facilitated by the presence underlying disease. It is a major
threat to hospitalized patients, particularly those with serious underlying
diseases such as Cancer and Burns (Burning causes breakdown of nonspecific host
defenses).
Sites
of infection by P. aeruginosa
- Central Nervous system infections
- Localized infections of ear and sinus
- Skin and Musculoskeletal tissues, Burn wounds, surgical wounds
- Respiratory tract: Chronic infections in cystic fibrosis patients, acute pneumonia in other patients
- Bacteremia
- Endocarditis
- Urinary tract infections
Mortality
in P. aeruginosa infection:
Infections with P.
aeruginosa are associated with high mortality rate. This is because of the
combination of
- Bacterial resistance to antibiotics
- Weakened host defenses
- Production of extracellular bacterial enzymes and toxins.
Pathogenesis
of P. aeruginosa
Pseudomonas
aeruginosa produces many factors that may contribute to its
virulence. Some of them are
- Hemolysins: Glycolipid hemolysin may play a role in P. aeruginosa pulmonary infections.
- Extracellular polysaccharide: They may impede phagocytosis and impair diffusion of antibiotics and thus facilitate colonization and persistence. These mucoid strains usually are isolated only from patients with cystic fibrosis.
- Pigments: Pyocyanin (a phenazine pigment) and fluorescein are two common pigments produced by P aeruginosa. Pyocyanin retards the growth of some other bacteria and thus may facilitate colonization by P aeruginosa.
- Extracellular protease: May play role in the formation of hemorrhagic lesions and tissue destructions.
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