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. 1978 Jul;21(1):163–170. doi: 10.1128/iai.21.1.163-170.1978

Microassay for immunoglobulin G antibodies to Treponema pallidum with radioiodinated protein A from staphylococcus aureus: immunoglobulin G response in experimental syphilis in rabbits.

P M Zeltzer, J S Pepose, N H Bishop, J N Miller
PMCID: PMC421972  PMID: 361561

Abstract

Radioiodinated staphylococcal protein A (SpA) was used to detect the immunoglobulin G (IgG) antibody response to Treponema pallidum in experimental syphilis. This solid-phase assay is based on the principle that SpA binds avidly to the Fc portion of mammalian IgG. The optimal number of organisms for detection of antibody was 10(5) per microwell. Of eight fixatives, 10% ethanol gave an optimum immune binding ratio of infected to normal rabbit serus at a 1:100 serum dilution. Kinetic studies demonstrated maximum binding and the highest immune binding ratio (15:1) with a 60-min incubation each for antibody and (125)I-SpA, respectively. The IgG response in rabbits intratesticularly infected with live T. pallidum and bled at -1, 9, 30, 90, 180, and 480 days was detected first at 9 days, reached a peak at 30 days, and remained elevated for 480 days. Absorption studies with an extract of T. phagedenis biotype reiterii demonstrated that 65 to 85% of the total antitreponemal IgG response was specific for T. pallidum throughout the course of infection. The microassay was quantitative and detected less than 2 ng of antibody.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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