Cellular immunity and immunostimulation in paracoccidioidomycosis.

We have evaluated clinical and laboratorial effects of immunostimulation scarification with antigen of Paracoccidioides brasiliensis in patients with paracoccidioidomycosis, who often show depressed immunity. We have studied 62 Brazilian patients with paracoccidioidomycosis, 46 with active disease and 16 cured, in a 10-year period between 1982 and 1992. Among the 46 patients with active disease: 10 had acute form, 12 chronic unifocal form and 24 the chronic multifocal form of the disease; 16 showed positive paracoccidioidin intradermal reaction and 30 negative reaction. Amongst 16 cured patients, 5 showed negative paracoccidioidin intradermal reaction and 11 positive reaction. We immunostimulated 20 patients by scarification with polysaccharide antigen of Paracoccidioides brasiliensis. All 20 immunostimulated patients had negative paracoccidioidin intradermal reaction, and 18 patients had active disease and 2 were cured. Out of 18 immunostimulated patients with active disease, 3 had active form, 10 chronic multifocal form and 5 chronic unifocal form of the disease. Before and after immunostimulation, each patients was inmunologically evaluated by in vivo and in vitro methods; in vivo methods consisted of intradermal reactions and DNCB sensitization tests; and in vitro methods consisted of total sub-set lymphocyte counting, leukocytes migration inhibition test, chemotaxix of total leukocytes and monuclear leukocyte phagocytosis. Remaining 42 patients served as a non-immunostimulated control group who has followed only clinically. We have observed significant clinical and immunological improvement in immunostimulated patients. We conclude that the immunostimulation by scarification with antigen of P. brasiliensis can be a helpful adjuvant therapy for paracoccidioidomycosis.