Histoplasma capsulatum

Histoplasma capsulatum
A dimorphic fungus species of worldwide distribution that causes histoplasmosis in humans and other mammals; its ascomycetous state is Ajellomyces capsulatum. The organism's natural habitat is soil fertilized with bird and bat droppings, where it grows as a mold, fragments of which, following inhalation, produce the primary pulmonary infection; within the mammalian host tissues, inhaled mycelial fragments grow as uninuclear yeasts that reproduce by budding. This parasitic form may also be induced in the laboratory by culturing the mycelial phase at 37°C on a blood-enriched medium; growth reverts to the mycelial form when the temperature is below 37°C. H. var. duboisii causes a clinically distinct disease, African histoplasmosis, in which large yeast cells with thicker walls are found in tissues, in contrast to the small yeast cells of H. var. farciminosum, which causes epizootic lymphangitis. [histo- + G. plasma, something formed]

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the etiologic agent of classic histoplasmosis, occurring as small, oval, yeastlike cells which in tissue seem to be encapsulated but are not. It grows as a mycelial fungus in the soil and as a yeast at 37° C on agar or in tissue. Its perfect (sexual) stage is Ajellomyces capsulatus.

Medical dictionary. 2011.

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Look at other dictionaries:

  • HISTOPLASMA CAPSULATUM — Histoplasma capsulatum …   Wikipédia en Français

  • Histoplasma Capsulatum — Histoplasma capsulatum …   Wikipédia en Français

  • Histoplasma capsulatum — Histoplasma capsulatum …   Wikipédia en Français

  • Histoplasma capsulatum — var. duboisii, einige Zellen vermehren sich gerade durch Sprossung Systematik Klasse …   Deutsch Wikipedia

  • Histoplasma capsulatum — organismo fúngico dimórfico que es una levadura gemante a la temperatura corporal y un moho a temperatura ambiente. Es el organismo causal de la histoplasmosis. Diccionario Mosby Medicina, Enfermería y Ciencias de la Salud …   Diccionario médico

  • Histoplasma capsulatum —   Histoplasma capsulatum Clasificación científica Reino …   Wikipedia Español

  • Histoplasma capsulatum — Histoplasma capsulatum …   Wikipédia en Français

  • Histoplasma capsulatum var. duboisii — a variant form larger than other variants, the cause of the African form of histoplasmosis …   Medical dictionary

  • Histoplasma capsulatum var. farciminosum — the etiologic agent of lymphangitis epizootica, differing from the other variants in having smooth macroaleuriospores in the saprobic stage. Called also H. farciminosum …   Medical dictionary

  • histoplasma — un género de hongos perteneciente al grupo de las levaduras asporógenas. El Histoplasma capsulatum es un hongo dimórfico que crece bien como una forma filamentosa, bien formando microconidias. En el hombre produce la histoplasmosis… …   Diccionario médico

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