Abstract
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.
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Acknowledgments
Animal procedures were approved by the Committees on Biosafety and Animal Handling and Ethical Regulations of the National Institute of Infectious, Diseases, Japan. This work was supported by the Research on Emerging and Re-emerging Infectious Diseases from Ministry of Health, Labour and Welfare, Japan (H17-Shinkou-019 and H20-Shinkou-ippan-015), and the Research on Biological Resources and Animal Models for Drug Development from Ministry of Health, Labour and Welfare, Japan (H19-Seibutsushigen-ippan-003).
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Ito, M., Mukai, Rz., Takasaki, T. et al. Antibody-dependent enhancement of dengue virus infection in vitro by undiluted sera from monkeys infected with heterotypic dengue virus. Arch Virol 155, 1617–1624 (2010). https://doi.org/10.1007/s00705-010-0741-x
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DOI: https://doi.org/10.1007/s00705-010-0741-x