Orientia tsutsugamushi is the causative agent of scrub typhus. One of the protein antigens of this species, the conserved 47-kDa protein (HtrA), has been shown to induce an antibody response in patients and can provide protective immunity against live challenge by Orientia in mice. Pepscan
We investigated the 47-kDa outer membrane protein (OMP), which is a periplasmic serine protease and an antigenic major surface protein of Orientia tsutsugamushi, as a vaccine candidate. We developed a conventional subunit vaccine expressing recombinant 47-kDa OMP (rec47) and a DNA vaccine (p47). In
Orientia tsutsugamushi, a causative agent of scrub typhus, is an obligate intracellular bacterium, which escapes from the endo/phagosome and replicates in the host cytoplasm. O. tsutsugamushi infection induces production of pro-inflammatory mediators including interleukin-1β (IL-1β), which is
We screened a phage library of Rickettsia typhi with a polyclonal antiserum to clone genes which encode immunogenic proteins of R. typhi. Among several clones obtained, one clone codes for a 466-amino-acid protein similar to the heat-shock protein, HtrA. The deduced rickettsial HtrA contains a
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