This is the fungus which causes thrush.
In very rare cases it can cause a dangerous form of meningitis, especially in premature babies with very low birth weight.
This fungus causes most cases of fungal meningitis.
Cryptococcal meningitis is caused by a yeast or fungus commonly found in the environment, including the soil, everywhere in the world.
Generally, only people with deficiencies of the immune system including inherited immune conditions, HIV, cancer or, more rarely, diabetes develop serious cryptococcal infection, such as meningitis.
Symptoms may include headache, fever, nausea, vomiting, stiff neck, dislike of bright lights, changes in mental state and hallucinations. Symptoms do not come on suddenly as with acute bacterial meningitis but appear gradually.
Treatment is with antifungal medication, for instance or amphotericin B, flucytosine and fluconazole. Many patients will need "maintenance therapy" - which means they will have to continue taking medication indefinitely.