Histoplasmin Sensitivity Among Cattle in Panama: Report of 691 Negative Tests


No reactors to histoplasmin, in dilutions as low as 1:5, were seen among 691 dairy cattle drawn from widely scattered areas of the Republic of Panamá. No correlation between bovine and human sensitivities was apparent, thus suggesting that cattle and man are not sensitized by the same outside source. It was concluded that cattle, at least in this region, do not constitute an important animal reservoir for Histoplasma capsulatum.