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  • Title: [Immunological properties of Weil-Felix test negative sera from patients with Japanese spotted fever].
    Author: Amano K, Suto T, Mahara F.
    Journal: Kansenshogaku Zasshi; 1995 Apr; 69(4):420-5. PubMed ID: 7751751.
    Abstract:
    Sera from 4 out of 19 patients with the Japanese spotted fever were negative to OX2 antigen of Weil-Felix (WF) test. These WF test negative sera were analyzed by ELISA and immunoblot used whole cells and lipopolysaccharides (LPS) of rickettsiae and Proteus strains as antigens. These acute-phase sera have already possessed the IgG antibodies against LPS of Proteus OX2 strain, whereas IgM antibodies in these acute- and convalescent-phase sera did not react with this LPS. On the other hand, the reactivity of IgM antibodies of the convalescent-phase sera in the 2 patients with LPS of Proteus OX19 strain increased as compared with that of the acute-phase sera by ELISA, and these IgM antibodies also showed the reactivity with bands of OX19-LPS in the immunoblot. On the basis of these results, it is interpreted that the WF test negative sera from patients with Japanese spotted fever are due to the presence of IgG antibodies against OX2-LPS in the sera.
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