alexa Scrub typhus vaccine candidate Kp r56 induces humoral and cellular immune responses in cynomolgus monkeys.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Chattopadhyay S, Jiang J, Chan TC, Manetz TS, Chao CC,

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Abstract A truncated recombinant 56-kDa outer membrane protein of the Karp strain of Orientia tsutsugamushi (Kp r56) was evaluated in cynomolgus monkeys (Macaca fascicularis) for immunogenicity and safety as a vaccine candidate for the prevention of scrub typhus. This recombinant antigen induced strong humoral and cellular immune responses in two monkeys and was found to be well tolerated. Antigen-specific immunoglobulin M (IgM) and IgG were produced to almost maximal levels within 1 week of a single immunization. Peripheral blood mononuclear cells from vaccinated animals showed an induction of antigen-specific proliferation and gamma interferon production. The Kp r56 was not as efficient as infection with live organisms in preventing reinfection but was able to reduce the inflammation produced at the site of challenge. This report describes the results of the first systematic study of the immunogenicity of a recombinant scrub typhus vaccine candidate in a nonhuman primate model.
This article was published in Infect Immun and referenced in Journal of Vaccines & Vaccination

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