3. Pneumocystis Pneumonia

Pneumocystis pneumonia (PCP) is a serious lung infection caused by a fungus called Pneumocystis jirovecii. It primarily affects individuals with weakened immune systems, such as those with HIV/AIDS or those undergoing immunosuppressive treatments. PCP can cause symptoms like cough, fever, and difficulty breathing. It is diagnosed through medical tests and requires prompt treatment with antifungal medications. Prevention with medication is recommended for at-risk individuals to avoid severe illness. Due to its association with weakened immunity, PCP serves as an important indicator of immune system health.