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Living with Pneumocystosis

A lung infection caused by a fungus that mostly develops in people with a weakened immune system.

Understanding Pneumocystosis

Pneumocystosis is a lung infection caused by the fungus Pneumocystis jiroveci.

It is an opportunistic infection, meaning it develops in people whose immune systems are weakened. It is airborne and is found in the lungs. In people with AIDS, other parts of the body may be involved. It comes on gradually with cough, breathing trouble and fever. The most reliable test is a lung wash called bronchoalveolar lavage.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Dry cough
  • Trouble breathing (dyspnea)
  • Fever
  • Breathlessness with activity
  • Low blood oxygen
  • Weight loss

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What tests confirm this infection?
Which medicine is used to treat it?
How can my immune health be supported to lower the chance of it returning?

Quick facts

Symptoms usually startany time in life

The infection is caused by the fungus Pneumocystis jiroveci, which develops in people with weakened immune systems.

Infectious

Also known as: pcp; pcp - pneumocystis pneumonia; pjp; pneumocystis; pneumocystis carinii pneumonia; pneumocystis jirovecii pneumonia

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · PneumocystosisGARD ID 4386 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Pneumocystosis.

Explore the Pneumocystosis blog

Explore research for Pneumocystosis

Explore actively recruiting Pneumocystosis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Pneumocystosis with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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