Antigens were isolated from vaccines against American Cutaneous Leishmaniasis (ACL) and their reactivity tested against nine different groups of human sera and two groups of dog sera. These antigens react specifically with human and dog visceral leishmaniasis sera when compared to sera from non-infected individuals. Sera from humans from endemic areas of ACL before, or one year after, vaccination, and ACL patients treated and cured by immunotherapy with polyvalent vaccine, did not display significant differences of reactivity to these antigens. In contrast, they displayed a significantly higher reactivity to the antigens when compared to sera from healthy humans from non-endemic areas. No sera reactivity was observed with patients carrying Chagas' disease or tuberculosis. These antigens are polysaccharides aggregates and present molecular masses ranging from 90 to over 200 KDa. These data suggest the use of these antigens for sero-diagnosis of human and canine visceral leishmaniasis.
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