Summary
Histoplasma capsulatum was isolated from the soil of Humboldt, a small village on the Aripuanã, River, State of Mato Grosso. Of six samples collected in the backyards of houses, where domestic fowls were reared, one was positive for this fungus. In accordance with this finding, a high percentage (63,1%) of positive reactions to the intradermal test of histoplasmin was observed among the inhabitants of Humboldt.