Two monkeys ( Macaca fascicularis ) each were infected with dengue virus type 1 (DENV-1) and type 2 (DENV-2). High levels of neutralizing antibody to homotypic serotype were detected from day 10 to week 58 after infection. Levels of cross-reactive neutralizing antibody to other serotypes were at lower levels or undetectable. Serum samples collected from day 10 to week 58 enhanced infection by homotypic and heterotypic serotypes of DENV when diluted, demonstrating antibody-dependent enhancement (ADE). The ADE activities to heterotypic and homotypic dengue virus infections peaked at dilutions of 1:10–1:100 and 1:100–1:1,000, respectively. Serum samples collected enhanced heterotypic dengue virus infection without any dilution. The results indicate that sera from infected monkeys have an ability to enhance heterotypic dengue virus infection in vitro without dilution, although some of these sera also possess neutralizing activity.
Archives of Virology – Springer Journals
Published: Oct 1, 2010
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