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Journal of Clinical Microbiology
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Comparative Study | Journal Article | Research Support, U.S. Gov't, P.H.S.

Immunoblot interpretation criteria for serodiagnosis of early Lyme disease.

S M Engstrom, E Shoop, R C Johnson
S M Engstrom
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E Shoop
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R C Johnson
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ABSTRACT

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).

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Immunoblot interpretation criteria for serodiagnosis of early Lyme disease.
S M Engstrom, E Shoop, R C Johnson
Journal of Clinical Microbiology Feb 1995, 33 (2) 419-427; DOI:

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Immunoblot interpretation criteria for serodiagnosis of early Lyme disease.
S M Engstrom, E Shoop, R C Johnson
Journal of Clinical Microbiology Feb 1995, 33 (2) 419-427; DOI:
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