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Infect Immun. 1970 June; 1(6): 555-558
Copyright © 1970 American Society for Microbiology. All Rights Reserved.

research-article

Immunoglobulin Class of Natural Human Antibodies Reactive with Treponema pallidum

A. J. Julian, L. C. Logan, L. C. Norins and I. R. Cohen1

a Venereal Disease Research Laboratory, Venereal Disease Branch, State and Community Services Division, National Communicable Disease Center, Atlanta, Georgia 30333

ABSTRACT

To aid the development of serological tests for incubating syphilis, a characterization was made of the background of natural anti-Treponema pallidum antibodies against which the initial immune response to syphilis takes place. Sera from presumed normal persons were studied with monospecific antisera in an indirect fluorescent-antibody procedure. Of 36 sera tested at a 1:5 dilution, all showed IgG reactivity with T. pallidum (Nichols strain), 58% showed IgM reactivity, and 20% showed IgA reactivity. The titer of IgG reactivity was considerably higher than that of the other two immunoglobulins. Heating the sera for 1 hr at 65 C abolished IgA and IgM anti-T. pallidum reactivity, but one-third of the sera retained IgG reactivity. Human Cohn fractions II and III1 from three commercial sources contained mostly IgG antibodies reactive with T. pallidum, but IgM and IgA antibodies were also present. IgG reactivity was found in a pool of presumably normal maternal sera from 20 mothers and in a corresponding pool of umbilical cord serum from their infants. IgM and IgA reactivities were present only in the maternal serum pool.

FOOTNOTES

1 Present address: Weizmann Institute of Science, P.O. Box 26, Rehovoth, Israel.

Infect Immun. 1970 June; 1(6): 555-558
Copyright © 1970 American Society for Microbiology. All Rights Reserved.





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Copyright © 1970 by the American Society for Microbiology. All rights reserved.