The sera of 87 Senegalese patients with various forms of leprosy were investigated. Two of the most reliable methods were used to detect circulating immune complexes : the radiolabelled C1q binding test and the Raji cell binding technique. Several fractions of complement, including C3, C4, factor B and the C3d product of C3 were also assayed. A material having the properties of immune complexes was detected in lepromatous and reactional leprosy. In tuberculous leprosy, only the Raji cell binding technique gave positive results. C3 and C4 were normal or slightly raised, but C3d was increased in all forms of the disease. There was no significant correlation between C3d values and the results of immune complexes detection tests.
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