Human histoplasmosis in Egypt-a preliminary serologic survey.

Thirteen (3%) of 441 patients had histoplasma antibodies in their sera when examined by the complement fixation test. The serologically histoplama positive individuals were all from a group of 266 patients complaining of chest disorders and from a sub-group of 147 such patients with positive findings on chest x-ray. There were no positives from a group of 175 patients complaining of fevers of unknown origin. The possibility of misdiagnosing lesions which may be due to histoplasmosis as being tuberculous must be considered indifferential diagnosis of pulmonary lesions.