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Pneumocystis jirovec is a tiny fungus that lives in the lungs of many people. Most people's immune systems keep the fungus under control. But if you have a weakened immune system, the fungus can make you very sick.
The most common type of infection is pneumocystis pneumonia (PCP). PCP once was the major cause of death for people with HIV/AIDS. But now, it is possible to prevent or treat most cases. The key to surviving PCP is early treatment. The first signs of PCP are fever, dry cough, shortness of breath, and fatigue. If you have a weakened immune system and have these symptoms, see your doctor right away.
To diagnose PCP, doctors use a microscope to look for the fungus in a sample of lung fluid or tissue. Treatment is with antibiotics.
There is no vaccine to prevent PCP. Some people who are at high risk of getting PCP may need to take antibiotics to prevent it.
- Symptoms of Pneumocystis pneumonia (Centers for Disease Control and Prevention)
Diagnosis and Tests
- Pneumocystis Pneumonia Diagnosis and Testing (Centers for Disease Control and Prevention)
Prevention and Risk Factors
- Pneumocystis Pneumonia Risk and Prevention (Centers for Disease Control and Prevention)
Treatments and Therapies
- Treatment and Outcomes for Pneumocystis Pneumonia (Centers for Disease Control and Prevention)
- CD4 and CD8 (American Association for Clinical Chemistry)
Statistics and Research
- Pneumocystis Pneumonia Statistics (Centers for Disease Control and Prevention)
- ClinicalTrials.gov: Pneumocystis Infections (National Institutes of Health)
Journal ArticlesReferences and abstracts from MEDLINE/PubMed (National Library of Medicine)
Find an Expert
- AIDSinfo (Department of Health and Human Services) Also in Spanish
- Centers for Disease Control and Prevention Also in Spanish
- National Institute of Allergy and Infectious Diseases
- Pneumocystis Pneumonia (For Parents) (Nemours Foundation)