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Sodium deoxycholate-solubilized Borrelia burgdorferi antigen was prepared for use in a solid-phase fluoroimmunoassay (FIA-L) to detect antibodies in
Lyme disease. Serum specimens were tested by FIA-L and by a microimmunofluorescence test. The FIA-L results are comparable to those of the standard microimmunofluorescence test. The overall agreement was 0.98. Moreover, the FIA-L procedure is simple and rapid; fluorescence is objectively determined and is proportional to antibody titer.