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The Pathogenesis and Diagnosis of Pneumocystis jiroveci Pneumonia

Anna Apostolopoulou1, Jay A Fishman1,2

  • 1Division of Infectious Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.

Journal of Fungi (Basel, Switzerland)
|November 10, 2022
PubMed

Insights

Pneumocystis pneumonia (PJP) is a serious fungal infection in immunocompromised individuals, often occurring after organ transplants. Understanding PJP pathogenesis and improving diagnostics are crucial for patient care.

Area of Science:

  • Medical Mycology
  • Infectious Diseases
  • Immunocompromised Host Pathogenesis

Background:

  • Pneumocystis jiroveci is a significant fungal pathogen, particularly in immunocompromised populations.
  • The environmental source of P. jiroveci remains unidentified, complicating transmission control.
  • Pneumocystis pneumonia (PJP) arises from airborne transmission or reactivation, frequently observed post-organ transplantation and during intensified immunosuppression (e.g., corticosteroids, CMV infections).

Purpose of the Study:

  • To synthesize current knowledge on the pathogenesis of Pneumocystis pneumonia (PJP).
  • To critically evaluate the diagnostic methods for PJP, highlighting their strengths and limitations.
  • To identify key areas requiring further investigation in PJP research.

Main Methods:

  • This is a review article, synthesizing existing literature.
  • Data on PJP pathogenesis and diagnostic modalities were compiled and analyzed.
  • Areas for future research were identified based on current knowledge gaps.

Main Results:

  • PJP incidence is high within six months of organ transplantation, especially with prolonged immunosuppression.
  • Infection can manifest during recovery from neutropenia and lymphopenia.
  • Early diagnosis and treatment may necessitate invasive procedures.

Conclusions:

  • Despite being a recognized clinical entity, the pathogenesis of PJP is not fully elucidated.
  • Diagnostic approaches for PJP require careful consideration of their respective advantages and disadvantages.
  • Further research is essential to advance our understanding and management of PJP.
Keywords:
AIDSHIVPneumocystis jiroveciPneumocystis pneumoniacorticosteroidscytomegalovirusfungal infectionhematopoietic stem cell transplantationorgan transplantation

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