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6000 x 4400 pixels
50.8 x 37.3 cm ⏐ 20.0 x 14.7 in (300dpi)
ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Illustration of spores of the yeast-like fungus Histoplasma capsulatum. When inhaled these spores can cause a respiratory disease called histoplasmosis. The primary pulmonary form is usually harmless. Occasionally a progressive histoplasmosis develops which resembles tuberculosis. Histoplasmin, an antigenic material produced by the fungus, is used to test for the disease. H. capsulatum has a mycelial form which is found in soil enriched by animal excrement. The spores are produced by the hyphae, the threadlike structures.
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