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Genomic data from 110 Zika virus (ZIKV) samples reveal rapid spread across the Americas. This study highlights undetected viral circulation and identifies key mutations impacting ZIKV evolution and diagnostics.

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Area of Science:

  • Virology
  • Genomics
  • Epidemiology

Background:

  • The Zika virus (ZIKV) epidemic in the Americas raised significant public health concerns due to its association with birth defects.
  • However, a limited availability of genomic data has hindered a comprehensive understanding of ZIKV epidemiology and evolution.

Purpose of the Study:

  • To address the knowledge gap by generating extensive ZIKV genomic data from clinical and mosquito samples across the Americas.
  • To analyze the introduction patterns and evolutionary dynamics of ZIKV during the recent outbreak.

Main Methods:

  • Utilized multiple sequencing approaches to generate 110 ZIKV genomes.
  • Conducted phylogenetic analysis to trace viral introductions and expansion across 10 countries and territories.

Main Results:

  • Generated a significantly expanded dataset of ZIKV genetic diversity from the outbreak.
  • Phylogenetic analysis indicated rapid ZIKV expansion in Brazil and multiple introductions into various regions, including Puerto Rico, Honduras, Colombia, Caribbean islands, and the continental United States.
  • Identified instances of prolonged, undetected ZIKV circulation prior to official case confirmation.

Conclusions:

  • The study underscores the importance of robust surveillance for viral infections.
  • Identified mutations may have implications for ZIKV biology, pathogenesis, and diagnostic test efficacy.
  • The findings provide crucial insights into the genetic diversity and spread of ZIKV during the epidemic.