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Evaluation of Zika Virus-specific T-cell Responses in Immunoprivileged Organs of Infected Ifnar1-/- Mice
Published on: October 17, 2018
Enhancement of Zika virus pathogenesis by preexisting antiflavivirus immunity
Susana V Bardina1, Paul Bunduc1, Shashank Tripathi1,2
1Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
Abstract:
Zika virus (ZIKV) is spreading rapidly into regions around the world where other flaviviruses, such as dengue virus (DENV) and West Nile virus (WNV), are endemic. Antibody-dependent enhancement has been implicated in more severe forms of flavivirus disease, but whether this also applies to ZIKV infection is unclear. Using convalescent plasma from DENV- and WNV-infected individuals, we found substantial enhancement of ZIKV infection in vitro that was mediated through immunoglobulin G engagement of Fcγ receptors. Administration of DENV- or WNV-convalescent plasma into ZIKV-susceptible mice resulted in increased morbidity-including fever, viremia, and viral loads in spinal cord and testes-and increased mortality. Antibody-dependent enhancement may explain the severe disease manifestations associated with recent ZIKV outbreaks and highlights the need to exert great caution when designing flavivirus vaccines.
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