Conditions and symptoms
What Is Cryptococcal Meningitis? Plain-English Guide
Cryptococcal meningitis · say it: krip-toh-KOK-ul men-in-JY-tisAlso written: cryptococcal meningoencephalitis, Cryptococcus infection of the brain, CM
Short answer
Cryptococcal meningitis is a serious fungal infection of the lining around the brain, mostly in people with weakened immune systems.
What it means
Cryptococcal meningitis is an infection of the meninges, the protective layers around the brain and spinal cord, caused by a fungus called Cryptococcus. The fungus is found in the environment, for example in soil and bird droppings, and is breathed in. It mainly causes illness in people whose immune systems are weakened, such as those with advanced HIV or on strong immune-suppressing medicines. It is a medical emergency: a worsening headache, fever, stiff neck, confusion, vomiting or vision changes need urgent medical help.
It appears on antifungal medicine labels, such as fluconazole and amphotericin B, under 'Indications', because these are used to treat or prevent it. It also comes up in HIV medicine warnings about immune reconstitution syndrome, because an unrecognised cryptococcal infection can flare when the immune system recovers.
Cryptococcal meningitis is different from bacterial or viral meningitis, which have different causes and treatments. A lumbar puncture (spinal tap) and tests such as the cryptococcal antigen test help tell them apart.
Where you may see it
- The 'Indications and Usage' section of antifungal medicine labels
- HIV clinic notes and immune reconstitution warnings
- Lab reports for cryptococcal antigen (CrAg) and spinal fluid tests
📄 How it looks on a report
Indicated for the treatment of cryptococcal meningitis.
🙅 What it does not mean
- It is not contagious from person to person in normal contact.
- A positive cryptococcal antigen blood test does not always mean meningitis; further tests decide that.
- It is not the same as bacterial meningitis, although both are serious.
🗒️ Questions to ask your doctor
💊 Medicines whose labels mention “Cryptococcal meningitis”
Plain-English explanations of each medicine, from its official FDA label.
- Fluconazole
an azole antifungal medicine, a type of medicine that treats fungal (yeast) infections
🔗 Read more from trusted sources
- “Cryptococcal meningitis” on MedlinePlus ↗
US National Library of Medicine
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