1921
Volume 99, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Abstract.

The recent Zika virus (ZIKV) epidemic swept across Latin America and the Caribbean, where dengue virus (DENV) is endemic. The antigenic similarities of these closely related flaviviruses left researchers and clinicians with challenges to interpret serological tests. Thirty-six women attending a prenatal clinic in Honduras and with positive DENV IgM enzyme-linked immunoabsorbent assays (ELISAs) were screened with a ZIKV immunoglobulin M ELISA, reverse transcription polymerase chain reaction for ZIKV and DENV 1–4, and plaque reduction neutralization tests (PRNTs) for ZIKV and DENV-2. Plaque reduction neutralization test results were interpreted using the World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC) criteria. Using the WHO criteria of a PRNT90 titer ≥ 20 and a 4-fold difference between ZIKV and DENV titers, we determined that 69.4% of samples had a recent ZIKV infection, compared with 5.6% using CDC criteria. The interpretation of ZIKV PRNTs in a DENV-endemic region is highly dependent on the choice of interpretation criteria.

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  • Received : 20 Mar 2018
  • Accepted : 24 May 2018
  • Published online : 25 Jun 2018

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