Histoplasmin sensitivity among a student population in Crema, Po Valley, Italy.

Histoplasmin skin tests were conducted on a student population in Crema, Po Valley, Italy. In this geographical area two autochtonal cases of disseminated histoplasmosis occurred in HIV-negative men. In the last year we tested 776 senior high school students, mean age 18 years, 335 males and 441 females. Histopalsmin skin sensitivity was 1.23%, with a mean area of induration of 5.78 mm. All subjects but one had never been abroad. This preliminary survey confirms the possibility of autochtonal histoplasmal infection in the Po Valley, Italy.