URL of this page: https://www.nlm.nih.gov/medlineplus/pneumocystisinfections.html

Pneumocystis Infections


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 your immune system is weak, the fungus can make you very sick.

The most common problem 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 difficulty breathing, fever and a dry cough. If you have these symptoms, see your doctor right away.

Start Here



Treatments and Therapies

Living With

  • CD4 and CD8 (American Association for Clinical Chemistry)

Related Issues

Statistics and Research

Clinical Trials

Find an Expert


Patient Handouts