Cryptococcosis is infection caused by the fungus Cryptococcus neoformans.
Cryptococcus occurs primarily in soil that is contaminated with pigeon droppings. The fungus is present around the world, but infection was relatively rare until the AIDS epidemic began. The fungus sometimes infects people with Hodgkin lymphoma or sarcoidosis and those who are receiving long-term corticosteroid treatment. However, cryptococcosis can also develop in people with a normal immune system.
Cryptococcosis occurs mainly in the following:
Other organs are sometimes involved.
Symptoms and Diagnosis
Cryptococcosis usually causes mild and vague symptoms. Other symptoms occur depending on where the infection is:
To diagnose the infection, a doctor takes samples of tissue and body fluids to be cultured and examined. Blood and spinal fluid may be tested for certain substances released by Cryptococcus.
People with a functioning immune system who have Cryptococcus in only a small part of their lungs usually do not require any treatment. However, people with a lung infection are often treated with fluconazole, given by mouth, to shorten the duration of their illness. For meningitis, amphotericin B and flucytosine are given intravenously, followed by fluconazole given by mouth. For a skin infection, people are usually given fluconazole by mouth or, if the infection is severe, amphotericin B intravenously.
People with a weakened immune system may be given fluconazole, amphotericin B, sometimes flucytosine, or a combination. If people with AIDS develop cryptococcosis, they usually need to take an antifungal drug, usually fluconazole, for the rest of their life. However, they may be able to stop the antifungal drug if their CD4 count (the number of one type of white blood cell) increases and stays high enough for at least 6 months.
Last full review/revision October 2008 by Alan M. Sugar, MD