Powassan Virus: An Emerging Arbovirus of Public Health Concern in North America

Meghan Hermance, Saravanan Thangamani

Research output: Contribution to journalReview article

33 Citations (Scopus)

Abstract

Powassan virus (POWV, Flaviviridae) is the only North American member of the tick-borne encephalitis serogroup of flaviviruses. It is transmitted to small- and medium-sized mammals by Ixodes scapularis, Ixodes cookei, and several other Ixodes tick species. Humans become infected with POWV during spillover transmission from the natural transmission cycles. In humans, POWV is the causative agent of a severe neuroinvasive illness with 50% of survivors displaying long-term neurological sequelae. POWV was recognized as a human pathogen in 1958 when a young boy died of severe encephalitis in Powassan, Ontario, and POWV was isolated from the brain autopsy of this case. Two distinct genetic lineages of POWV are now recognized: POWV (lineage I) and deer tick virus (lineage II). Since the index case in 1958, over 100 human cases of POWV have been reported, with an apparent rise in disease incidence in the past 16 years. This recent increase in cases may represent a true emergence of POWV in regions where the tick vector species are prevalent, or it could represent an increase in POWV surveillance and diagnosis. In the past 5 years, both basic and applied research for POWV disease has intensified, including phylogenetic studies, field surveillance, case studies, and animal model development. This review provides an overview of POWV, including the epidemiology, transmission, clinical disease, and diagnosis of POWV infection. Recent research developments and future priorities with regard to the disease are emphasized.

Original languageEnglish (US)
Pages (from-to)453-462
Number of pages10
JournalVector-Borne and Zoonotic Diseases
Volume17
Issue number7
DOIs
StatePublished - Jul 1 2017

Fingerprint

Tick-Borne Encephalitis Viruses
Arboviruses
Ixodes
North America
Public Health
Tick-Borne Encephalitis
Ticks
Flaviviridae
Flavivirus
Ontario
Research
Survivors
Mammals
Autopsy
Epidemiology
Animal Models
Viruses
Incidence
Brain
Infection

Keywords

  • Deer tick virus
  • encephalitis
  • Ixodes scapularis
  • Powassan virus
  • tick-borne flavivirus

ASJC Scopus subject areas

  • Microbiology
  • Infectious Diseases
  • Virology

Cite this

Powassan Virus : An Emerging Arbovirus of Public Health Concern in North America. / Hermance, Meghan; Thangamani, Saravanan.

In: Vector-Borne and Zoonotic Diseases, Vol. 17, No. 7, 01.07.2017, p. 453-462.

Research output: Contribution to journalReview article

Hermance, Meghan ; Thangamani, Saravanan. / Powassan Virus : An Emerging Arbovirus of Public Health Concern in North America. In: Vector-Borne and Zoonotic Diseases. 2017 ; Vol. 17, No. 7. pp. 453-462.
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