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Cryptococcosis is a potentially fatal fungal infection of mainly the lungs, presenting as a pneumonia, and in the brain, where it appears as a meningitis. [4] [9] Coughing, difficulty breathing, chest pain and fever are seen when the lungs are infected. [5]
Cryptococcus neoformans is an encapsulated basidiomycetous yeast [1] belonging to the class Tremellomycetes and an obligate aerobe [2] that can live in both plants and animals. Its teleomorph is a filamentous fungus , formerly referred to Filobasidiella neoformans .
The teleomorph was first described in 1975 by K.J. Kwon-Chung, who obtained cultures of the type species, Filobasidiella neoformans, by crossing strains of the yeast Cryptococcus neoformans. She was able to observe basidia similar to those of the genus Filobasidium, hence the name Filobasidiella for the new genus. [3]
Cryptococcus gattii, formerly known as Cryptococcus neoformans var. gattii, is an encapsulated yeast found primarily in tropical and subtropical climates. Its teleomorph is Filobasidiella bacillispora, a filamentous fungus belonging to the class Tremellomycetes.
Cryptococcus neoformans is the major human and animal pathogen. Papiliotrema laurentii and Naganishia albida , both formerly referred to Cryptococcus , have been known to occasionally cause moderate-to-severe disease in human patients with compromised immunity.
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[1] [7] Systemic fungal infections are more serious and include cryptococcosis, histoplasmosis, pneumocystis pneumonia, aspergillosis and mucormycosis. [3] Signs and symptoms range widely. [3] There is usually a rash with superficial infection. [2] Fungal infection within the skin or under the skin may present with a lump and skin changes. [3]
The most common fungal meningitis is cryptococcal meningitis due to Cryptococcus neoformans. [39] In Africa, cryptococcal meningitis is now the most common cause of meningitis in multiple studies, [40] [41] and it accounts for 20–25% of AIDS-related deaths in Africa. [42]