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Infection and Immunity, June 1999, p. 3019-3025, Vol. 67, No. 6
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Prior Genital Tract Infection with a Murine or Human Biovar of Chlamydia trachomatis Protects Mice against Heterotypic Challenge Infection

Kyle H. Ramsey,1,* Todd W. Cotter,2 Rena D. Salyer,1 Gurwattan S. Miranpuri,2 Michael A. Yanez,1 Christoffer E. Poulsen,1 Jennifer L. DeWolfe,1 and Gerald I. Byrne2

Microbiology Department, Chicago College of Osteopathic Medicine, Midwestern University, Downers Grove, Illinois 60515,1 and Department of Medical Microbiology and Immunology, University of Wisconsin Medical School, Madison, Wisconsin 537062

Received 15 October 1998/Returned for modification 4 January 1999/Accepted 31 March 1999

We sought to assess the degree of cross-protective immunity in a mouse model of chlamydial genital tract infection. Following resolution of genital infection with the mouse pneumonitis (MoPn) biovar of Chlamydia trachomatis, mice were challenged intravaginally with either MoPn or human serovar E or L2. The majority of animals previously infected with MoPn were solidly immune to challenge with either of the two human biovars. Surprisingly, approximately 50% of animals became reinfected when homologously challenged with MoPn, although the secondary infection yielded significantly lower numbers of the organism isolated over a shorter duration than in the primary infection. Primary infection with serovar E also protected against challenge with MoPn or serovar L2, although the degree of immune protection was lower than that resulting from primary infection with MoPn. Blast transformation and assessment of delayed-type hypersensitivity indicated that mice previously infected with either human or murine biovars produced broadly cross-reactive T cells that recognized epitopes of either murine or human biovars of C. trachomatis. Immunoblotting demonstrated that primary MoPn infection produced immunoglobulin G (IgG) antibody to antigens of MoPn as well as at least three distinct antigenic components of human serovar E, one of which was identical in molecular weight to the major outer membrane protein (MOMP). Primary infection with serovar E produced IgG antibody reactive against serovar E but not MoPn MOMP and against at least one ca. 60-kDa protein of both chlamydial strains. Our results indicate that primary genital infection of mice with murine C. trachomatis induces immunity against challenge with either of two human biovars.

* Corresponding author. Mailing address: Microbiology Department, Chicago College of Osteopathic Medicine, Midwestern University, 555 31st St., Downers Grove, IL 60515. Phone: (630) 515-6165. Fax: (630) 515-7245. E-mail: kramse{at}midwestern.edu.

Infection and Immunity, June 1999, p. 3019-3025, Vol. 67, No. 6
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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