Pneumonia - weakened immune system
Pneumonia is a lung infection. It can be caused by many different germs, including bacteria, viruses, and fungi.
This article discusses pneumonia that occurs in a person who has a hard time fighting off infection because of problems with the immune system. This type of disease is called "pneumonia in an immunocompromised host."
Related conditions include:
People whose immune system is not working well are less able to fight off germs. This makes them prone to infections from germs that do not often cause disease in healthy people. They are also more vulnerable to regular causes of pneumonia, which can affect anyone.
Your immune system may be weakened or not work well because of:
- Bone marrow transplant
- Chemotherapy
- HIV infection
- Leukemia, lymphoma, and other conditions that harm your bone marrow
- Autoimmune disorders
- Medicines (including steroids, and those used to treat cancer and control autoimmune diseases)
- Organ transplant (including kidney, heart, and lung)
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