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Virological and epidemiological studies on encephalitis in chiang mai area thailand in 1982 4. serological examination on hospitalized patients



Virological and epidemiological studies on encephalitis in chiang mai area thailand in 1982 4. serological examination on hospitalized patients



Tropical Medicine 25(3): 155-164



Paired sera (108) including 40 encephalitis and 54 dengue hemorrhagic fever(DHF), and 71 single sera including 15 encephalitis and 25 DHF cases, were examined by the hemagglutination-inhibition (HI) against Japanese encephalitis (JE) and dengue antigens, as well as by the enzyme-linked immunosorbent assay (ELISA) against JE antigen. By the HI test, 10 encephalitis and 3 DHF cases showed a primary antibody response, while there were 7 encephalitis and 28 DHF with secondary responses. Only 7 encephalitis and 10 DHF cases with paired sera showed monospecific HI antibody response to JE and dengue antigens, respectively, and there were 7 encephalitis cases with monospecific HI antibody response to dengue antigens. IgM-ELISA against JE antigen appeared to be a more specific indicator of recent infection by JE virus, and could detect 27 positive cases. Twenty-two were cases with paired sera and 16 of them did not show positive and monospecific HI antibody response to JE antigen. The remaining 5 cases were with single serum specimens. Serological tests suggested that at least 4 encephalitis cases were due to dengue virus infections.

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