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The development of a vaccine against genital chlamydia in women is advancing, and the evaluation of  in situ  immune responses following vaccination and challenge infections is crucial for development of a safe and protective vaccine. This study employs the sexually mature minipig model to characterize the genital  in situ  immune response to  Chlamydia trachomatis  infection in pigs previously immunized intramuscularly with UV-inactivated  C. trachomatis  serovar D (UV-SvD) adjuvanted/formulated with CAF01 adjuvant compared to a CAF01-alone control group. Pigs immunized with UV-SvD were significantly protected against vaginal challenge with  C. trachomatis  on day 3 post inoculation and showed significantly higher cervical infiltrations of approximately equal numbers of CD4 +  and CD8 +  T-cells, and IgG +  and IgA +  plasma cells compared to adjuvant-alone immunized controls. These immunological signatures correspond to findings in mice and are similar to those described in female chlamydia patients. This proves important potential for the pig model in elucidating immunological  in situ  signatures in future translational research in chlamydia vaccinology.

frontiers in microbiology

Genital Infiltrations of CD4+ and CD8+ T Lymphocytes, IgA+ and IgG+ Plasma Cells and Intra-Mucosal Lymphoid Follicles Associate With Protection Against Genital Chlamydiatrachomatis Infection in Minipigs Intramuscularly Immunized With UV-Inactivated Bacteria Adjuvanted With CAF01