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J Clin Microbiol. 1984 May; 19(5): 651-659

Antibody response to dengue-2 vaccine measured by two different radioimmunoassay methods.

ABSTRACT

Two different radioimmunoassays were used to detect virus-specific antibodies in sera from human volunteers inoculated with an attenuated dengue type 2 (DEN-2) vaccine (PR-159/S-1). An indirect radioimmunoassay required purified DEN-2 virions for optimal reactivity but was 10 to 500 times more sensitive than neutralization or hemagglutination inhibition tests. An antibody capture radioimmunoassay was able to utilize crude antigens from either DEN-infected mouse brains or Aedes albopictus cell culture supernatants. When the two radioimmunoassay techniques were compared, the indirect method appeared to be the best assay for immunoglobulin G (IgG), whereas the antibody capture method was more sensitive for IgM detection. Selected human sera were examined for IgG, IgM, and IgA responses by using both techniques at various intervals after immunization. Although there were differences in magnitude, yellow fever immune as well as flavivirus nonimmune volunteers responded to DEN-2 vaccination by demonstrating IgG, IgM, and IgA antibody responses. In the nonimmune group, the most prevalent immunoglobulin detected was IgM, whereas in the yellow fever immune group, the predominant post-DEN-2 vaccine immunoglobulin was IgG. The preponderance of DEN-2-specific neutralizing antibodies were associated with either IgM or IgG according to the immune status of the volunteer. All classes of immunoglobulins attained maximum levels between 21 and 60 days postvaccination. In the majority of volunteers, IgM responses were relatively transient and could not be detected 6 months after immunization, whereas IgG and IgA antibodies were still detectable after this period.

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