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Journal of Clinical Microbiology, 02 1995, 419-427, Vol 33, No. 2
SM Engstrom, E Shoop and RC Johnson
We monitored the antibody responses of 55 treated patients with early Lyme
disease and physician-documented erythema migrans. Six sequential serum
samples were obtained from patients before, during, and until one year
after antibiotic therapy and analyzed by in-house enzyme-linked
immunosorbent (ELISA) and immunoblot assays. An immunoblot procedure
utilizing a gradient gel and an image analysis system was developed. A
relational database management system was used to analyze the results and
provide criteria for early disease immunoblot interpretation. Recommended
criteria for the immunoglobulin M (IgM) immunoblot are the recognition of
two of three proteins (24, 39, and 41 kDa). The recommended criteria for a
positive IgG immunoblot are the recognition of two of five proteins (20, 24
[> 19 intensity units], 35, 39, and 88 kDa). Alternatively, if band
intensity cannot be measured, the 22-kDa protein can be substituted for the
24-kDa protein with only a small decrease in sensitivity. Monoclonal
antibodies were used to identify all these proteins except the 35-kDa
protein. With the proposed immunoblot interpretations, the sequential serum
samples were examined. At visit 1, the day of diagnosis and initiation of
treatment, 54.5% of the serum samples were either IgM or IgG positive. The
peak antibody response, with 80% of the serum samples positive, occurred at
visit 2, 8 to 12 days into treatment. The sensitivities of the IgM and IgG
immunoblot for detecting patients that were seropositive into the study
period were 58.5 and 54.6%, respectively, at visit 1 and 100% at visit 2.
Twenty percent of the patients remained seronegative throughout the study.
The specificities of the IgM and IgG immunoblots were 92 to 94% and 93 to
96%, respectively. The IgM immunoblot and ELISA were similar in
sensitivities, whereas the IgG immunoblot had greater sensitivity than the
IgG ELISA (P = 0.006).
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Immunoblot interpretation criteria for serodiagnosis of early Lyme disease
Department of Microbiology, University of Minnesota Medical School, Minneapolis.
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