Encapsulated pathogenic yeast fungus (Cryptococcus neoformans). Cryptococcus is a yeast-like fungus that reproduces by budding. An acidic mucopolysaccharide capsule completely encloses the fungus. It can cause the disease cryptococcosis; especially in immune deficient humans, such as patients with HIV or AIDS. The infection can cause meningitis in the lungs, skin or other body regions.