The two syphilis sera showed weak reactions: one with IgG against the proteins 4 1 and 29 kD, and IgM versus 6016 1 kB, the other IgG versus 83 kD. IMMUNOBLOT ANALYSIS IN LYME DISEASE 379 IFA titers. The titers of anti-B.burgdorferi-Ig ranged from 1:128 to 1:4096 (Table 1). ...