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PCP Pneumonia in HIV (Pneumocystis jirovecii Pneumonia)

Opportunistic fungal pneumonia caused by Pneumocystis jirovecii in HIV patients with CD4 <200, presenting with subacute progressive dyspnea, dry cough, fever, and bilateral interstitial infiltrates; AIDS-defining illness requiring TMP-SMX treatment, adjunctive corticosteroids for hypoxemia, and lifelong primary/secondary prophylaxis.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Internal Medicine department. Book Appointment →

What is PCP Pneumonia in HIV (Pneumocystis jirovecii Pneumonia)?

Pneumocystis jirovecii (formerly Pneumocystis carinii) is a unicellular fungus (atypical, with cell wall containing β-1,3-glucan but lacking ergosterol, resistant to most antifungals) that causes opportunistic pneumonia in immunocompromised hosts, especially HIV/AIDS patients with CD4 <200 cells/μL. It was a hallmark of the HIV epidemic and remains one of the most common AIDS-defining illnesses worldwide.

Clinical presentation is subacute over days to weeks: progressive exertional dyspnea, dry cough (productive in <30%), low-grade fever, and fatigue. Physical examination often unremarkable despite severe hypoxemia. Laboratory findings include elevated LDH (sensitive, non-specific), elevated 1,3-β-D-glucan, and characteristic chest imaging with bilateral perihilar interstitial or ground-glass infiltrates progressing to alveolar consolidation; pneumothorax may complicate.

Diagnosis confirmed by visualization of cysts or trophic forms in induced sputum (lower yield), bronchoalveolar lavage (gold standard, ~95% sensitivity), or lung biopsy with silver stain, Giemsa, or immunofluorescence. PCR is highly sensitive but may detect colonization. Treatment is TMP-SMX (Bactrim) 15-20 mg/kg/day TMP component IV or PO divided q6-8h for 21 days; alternatives for sulfa allergy include pentamidine IV, dapsone+trimethoprim, atovaquone, primaquine+clindamycin. Adjunctive corticosteroids (prednisone 40 mg BID tapered over 21 days) reduce mortality if PaO2 <70 mmHg or A-a gradient >35 mmHg.

Symptoms

Subacute progressive exertional dyspnea (over days-weeks)
Dry non-productive cough
Low-grade fever
Fatigue, weight loss
Hypoxemia (often severe with mild physical findings)
Tachypnea on examination
Pneumothorax (can complicate disease)

Risk Factors

HIV/AIDS with CD4 <200 cells/μL (hallmark)
Newly diagnosed HIV (often presenting opportunistic infection)
Treatment non-adherence in HIV
Solid organ or hematopoietic stem cell transplant
Long-term corticosteroid therapy (>20 mg prednisone >2 weeks)
Hematologic malignancies (especially with chemotherapy)
Biologic therapy (especially with concurrent steroids)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Progressive shortness of breath in HIV patient
  • Dry cough and fever in immunocompromised host
  • Low oxygen saturation in HIV with low CD4
  • Newly diagnosed HIV with respiratory symptoms
  • Bilateral pulmonary infiltrates on imaging
  • Sudden chest pain (possible pneumothorax)
  • Worsening dyspnea despite antibiotic therapy

Treatment Methods

01
TMP-SMX 15-20 mg/kg/day TMP component IV or PO divided q6-8h for 21 days (first-line)
02
Adjunctive corticosteroids if PaO2 <70 mmHg (prednisone 40mg BID tapered)
03
Alternative: pentamidine 4 mg/kg/day IV (renal/hepatic toxicity)
04
Alternative: dapsone + trimethoprim, atovaquone, or primaquine + clindamycin
05
Initiate ART within 2 weeks for HIV-naive patients
06
Primary prophylaxis when CD4 <200: TMP-SMX one DS tablet daily
07
Secondary prophylaxis until CD4 >200 for 3 months on ART

Which Department to Visit?

You can visit our Enfeksiyon Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Enfeksiyon Hastalıkları Department

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You can make an appointment with our specialists or contact us for your concerns.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.