alexa Protective efficacy of oral immunization with heat-killed Shigella flexneri 2a in animal model: study of cross protection, immune response and antigenic recognition.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Mukhopadhaya A, Mahalanabis D, Khanam J, Chakrabarti MK

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Abstract Oral immunization of rabbits with four doses of 10(11) heat-killed Shigella flexneri 2a showed 100\% protection against challenge with virulent S. flexneri 2a. After orally immunizing Guinea pigs with four doses of heat-killed S. flexneri 2a 100\% protection could be shown against ocular challenge with the same virulent S. flexneri 2a strain but this conferred no protection against challenge with Shigella dysenteriae type 1. In enzyme-linked immunosorbent assay (ELISA) and immunoblot experiments both whole cell lysate-envelope (WCL-E) fraction and outer membrane proteins (OMPs) were recognized by the antisera. Though protective mechanism in shigellosis is not established with certainty, outer membrane proteins (specially 38, 34, 23 and 20kDa proteins) may be the major antigens in the induction of protective immune responses as indicated by this observation.
This article was published in Vaccine and referenced in Journal of Vaccines & Vaccination

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