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Acute Flaccid Paralysis and Enteroviral Infections

  • Ari Bitnun
  • E. Ann Yeh
Neurological Infectious Diseases
Part of the following topical collections:
  1. Topical Collection on Neurological Infectious Diseases

Abstract

Purpose of Review

The focus of this review is on enterovirus (EV)-associated acute flaccid paralysis (AFP) due to spinal cord anterior horn cell disease. Emphasis is placed on the epidemiology, pathogenesis, diagnosis, treatment, and outcome of AFP caused by polioviruses, vaccine-derived polioviruses, EV-D68, and EV-A71.

Recent Findings

Since the launch of The Global Polio Eradication Initiative in 1988, the worldwide incidence of polio has been reduced by 99.9%, with small numbers of poliomyelitis cases being reported only in Afghanistan, Pakistan, and Nigeria. With the planned phaseout of oral polio vaccine, vaccine-associated poliomyelitis is also expected to be eliminated. In their place, other EVs, chiefly EV-D68 and EV-A71, have emerged as the principal causes of AFP. There is evidence that the emergence of EV-D68 as a cause of severe respiratory disease and AFP was due to recent genetic virus evolution. Antiviral medications targeting EV-D68, EV-A71, and other EVs will likely be available in the near future. An effective EV-A71 vaccine has been developed, and preliminary investigations suggest an EV-D68 vaccine could be on the horizon.

Summary

The eradication of poliomyelitis and vaccine-associated poliomyelitis is near, after which other EVs, presently EV-D68 and EV-A71, will be the principle viral causes of AFP. Moving forward, it is essential that EV outbreaks, in particular those associated with neurologic complications, be investigated carefully and the causal strains identified, so that treatment and prevention efforts can be rapidly developed and implemented.

Keywords

Acute flaccid paralysis Acute flaccid myelitis Enterovirus D68 Enterovirus A71 Poliovirus Poliomyelitis Vaccine-derived poliovirus 

Notes

Compliance with Ethical Standards

Conflict of Interest

Drs. Ari Bitnun and E. Ann Yeh declare that they have no conflicts of interest related to this project.

Human and Animal Rights and Informed Consent

This article does not contain any studies with human or animal subjects performed by any of the authors.

References

Papers of particular interest, published recently, have been highlighted as: • Of importance •• Of major importance

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Division of Infectious Diseases, The Hospital for Sick Children and Department of PediatricsUniversity of TorontoTorontoCanada
  2. 2.Division of Neurology, The Hospital for Sick Children and Department of Pediatrics, Division of Neurosciences and Mental Health, SickKids Research InstituteUniversity of TorontoTorontoCanada

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