Pneumocystis infection


Appropriate Tests


Diagnosis can be made by bronchial lavage with microscopy (special stains) and cytological examination.


PCR (NAA). Semi-quantitation of NAA specimens may aid distinguishing colonisation from infection

Infection occurs in the presence of Immunodeficiency, especially

  • Post-transplant immunosuppression
  • Corticosteroids
  • Severe protein malnutrition
  • AIDS

See also Infection (increased susceptibility)


Extrapulmonary pneumocystis infection can occur in AIDS, but is rare.

It is usually seen in patients with pneumocystis pneumonia who have not been receiving prophylactic cotrimoxazole.

Biopsy or Fine needle aspiration biopsy (special stains) of involved tissue, eg, lymph node, is usually diagnostic.