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. 1996 May;64(5):1778–1788. doi: 10.1128/iai.64.5.1778-1788.1996

Evaluation of humoral and cell-mediated inducible immunity to Haemophilus ducreyi in an animal model of chancroid.

M Desjardins 1, L G Filion 1, S Robertson 1, L Kobylinski 1, D W Cameron 1
PMCID: PMC173992  PMID: 8613391

Abstract

To study the mechanisms of inducible immunity to Haemophilus ducreyi infection in the temperature-dependent rabbit model of chancroid, we conducted passive immunization experiments and characterized the inflammatory infiltrate of chancroidal lesions. Polyclonal immunoglobulin G was purified from immune sera raised against H. ducreyi 35000 whole-cell lysate or a pilus preparation and from naive control rabbits. Rabbits were passively immunized with 24 or 48 mg of purified polyclonal immunoglobulin G intravenously, followed 24 h after infusion by homologous titered infectious challenge. Despite titratable antibody, no significant difference in infection or disease was observed. We then evaluated the immunohistology of lesions produced by homologous-strain challenge in sham-immunized rabbits and those protectively vaccinated by pilus preparation immunization. Immunohistochemical stains for CD5 and CD4 T-lymphocyte markers were performed on lesion sections 4, 10, 15, and 21 days from infection. Lesions of pilus preparation vaccinees compared with those of controls had earlier infiltration with significantly more T lymphocytes (CD5+) and with a greater proportion of CD4+ T lymphocytes at day 4 (33% +/- 55% versus 9.7% +/- 2%; P = 0.002), corroborating earlier sterilization (5.0 +/- 2 versus 13.7 +/- 0.71 days; P < 0.001) and lesion resolution. Intraepithelial challenge of pilus-vaccinated rabbits with 100 micrograms of the pilus preparation alone produced indurated lesions within 48 h with lymphoid and plasmacytoid infiltration, edema, and extravasation of erythrocytes. We conclude that passive immunization may not confer a vaccine effect in this model and that active vaccination with a pilus preparation induces a delayed-type hypersensitivity skin test response and confers protection through cell-mediated immunity seen as an amplified lymphocytic infiltrate and accelerated maturation of the T-lymphocyte response.

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Selected References

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