Pathogens
Stenotrophomonas maltophilia

Stenotrophomonas maltophilia

Precautions

See 'Additional Information'

Susceptibilities

General Information

  • Non-fermenting
  • Oxidase-negative
  • Gram-negative bacilli

Formerly named Pseudomonas

Must distinguish colonization from clinically significant infection.

May be acquired from diverse environmental sources (e.g. tap water).

Bronchiectatics may be colonized (i.e. CF patients).

Most common reason for isolation is colonization of the respiratory tract.

Most common true infections:

  • Blood stream infection (usually from vascular catheter)
  • Pneumonia
  • UTI (usually catheter associated)

Other manifestations rare:

  • Endocarditis
  • Sinusitis
  • Cellulitis

True pneumonia more likely in ICU and oncology patients, those with advanced age and after/during treatment with broad spectrum antimicrobial use.

Risk factors:

  • Underlying malignancy or immunocompromised
  • Indwelling devices
  • COPD
  • Prior broad spectrum antibiotic use
  • Extended hospitalization