* Cryptoccoccal Menigitis. A yeast-like fungus infection that usually involves the brain and lungs, although it can affect almost any organ. Most often occurs when a person's CD4+ T cell count falls below 100 cells per cubic millimeter of blood. | * Cryptoccoccal Menigitis. A yeast-like fungus infection that usually involves the brain and lungs, although it can affect almost any organ. Most often occurs when a person's CD4+ T cell count falls below 100 cells per cubic millimeter of blood. |