Enterovirus D68 Subclade B3 Strain Circulating and Causing an Outbreak in the United States in 2016

Guiqing Wang1,2, Jian Zhuge3, Weihua Huang4

  • 1Department of Pathology, New York Medical College, Valhalla, New York, USA. guiqing_wang@nymc.edu.

Scientific Reports
|April 30, 2017
PubMed

Insights

Enterovirus D68 (EV-D68) re-emerged in 2016 with a new B3 subclade strain causing an outbreak in New York. This highlights the genetic diversity and outbreak potential of EV-D68 strains, necessitating global surveillance.

Area of Science:

  • Virology
  • Epidemiology
  • Genomics

Background:

  • The United States experienced a nationwide Enterovirus D68 (EV-D68) outbreak in 2014.
  • Limited EV-D68 detection was reported in 2015 and 2016.
  • EV-D68 is a significant respiratory pathogen.

Purpose of the Study:

  • To analyze the prevalence and genetic characteristics of EV-D68 in the Lower Hudson Valley, New York, during 2015-2016.
  • To identify the circulating EV-D68 strain and its genetic relationship to previous strains.

Main Methods:

  • Analysis of 749 nasopharyngeal specimens collected in 2015-2016 using EV-D68-specific real-time reverse transcription polymerase chain reaction (rRT-PCR).
  • Whole-genome sequencing of detected EV-D68 strains using metagenomic next-generation sequencing.
  • Comparative genomic analysis to determine strain lineage and divergence.

Main Results:

  • No EV-D68 detected in 199 specimens from 2015.
  • EV-D68 detected in 0.9% of samples from January-May 2016 and 36.0% from July-October 2016.
  • A novel EV-D68 strain (subclade B3) was identified, causing 160 confirmed cases in a 2016 outbreak.
  • The new strain showed 3.2-4.8% nucleotide divergence from the 2014 B1 subclade strains.

Conclusions:

  • A new EV-D68 subclade B3 strain emerged and caused a significant outbreak in New York in 2016.
  • EV-D68 strains exhibit genetic variability and the potential for recurrent outbreaks.
  • Enhanced global surveillance is crucial for monitoring the circulation of diverse EV-D68 strains.