A chimeric Sindbis-based vaccine protects cynomolgus macaques against a lethal aerosol challenge of eastern equine encephalitis virus

Chad J. Roy, A. Paige Adams, Eryu Wang, Grace Leal, Robert Seymour, Satheesh K. Sivasubramani, William Mega, Ilya Frolov, Peter J. Didier, Scott Weaver

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Eastern equine encephalitis virus (EEEV) is a mosquito-borne alphavirus that causes sporadic, often fatal disease outbreaks in humans and equids, and is also a biological threat agent. Two chimeric vaccine candidates were constructed using a cDNA clone with a Sindbis virus (SINV) backbone and structural protein genes from either a North (SIN/NAEEEV) or South American (SIN/SAEEEV) strain of EEEV. The vaccine candidates were tested in a nonhuman primate (NHP) model of eastern equine encephalitis (EEE). Cynomolgus macaques were either sham-vaccinated, or vaccinated with a single dose of either SIN/NAEEEV or SIN/SAEEEV. After vaccination, animals were challenged by aerosol with a virulent North American strain of EEEV (NA EEEV). The SIN/NAEEEV vaccine provided significant protection, and most vaccinated animals survived EEEV challenge (82%) with little evidence of disease, whereas most SIN/SAEEEV-vaccinated (83%) and control (100%) animals died. Protected animals exhibited minimal changes in temperature and cardiovascular rhythm, whereas unprotected animals showed profound hyperthermia and changes in heart rate postexposure. Acute inflammation and neuronal necrosis were consistent with EEEV-induced encephalitis in unprotected animals, whereas no encephalitis-related histopathologic changes were observed in the SIN/NAEEEV-vaccinated animals. These results demonstrate that the chimeric SIN/NAEEEV vaccine candidate protects against an aerosol EEEV exposure.

Original languageEnglish (US)
Pages (from-to)1464-1470
Number of pages7
JournalVaccine
Volume31
Issue number11
DOIs
StatePublished - 2013

Fingerprint

Eastern equine encephalitis virus
Macaca fascicularis
Macaca
aerosols
Aerosols
lethal genes
Vaccines
vaccines
encephalitis
animals
Encephalitis
Eastern Equine Encephalomyelitis
Sindbis virus
Sindbis Virus
Alphavirus
Viral Structural Proteins
structural proteins
Biological Factors
Cerebral Palsy
Culicidae

Keywords

  • Aerosol
  • Alphavirus
  • Encephalitis
  • Nonhuman primate
  • Vaccine

ASJC Scopus subject areas

  • Immunology and Microbiology(all)
  • Infectious Diseases
  • Public Health, Environmental and Occupational Health
  • veterinary(all)
  • Molecular Medicine

Cite this

A chimeric Sindbis-based vaccine protects cynomolgus macaques against a lethal aerosol challenge of eastern equine encephalitis virus. / Roy, Chad J.; Adams, A. Paige; Wang, Eryu; Leal, Grace; Seymour, Robert; Sivasubramani, Satheesh K.; Mega, William; Frolov, Ilya; Didier, Peter J.; Weaver, Scott.

In: Vaccine, Vol. 31, No. 11, 2013, p. 1464-1470.

Research output: Contribution to journalArticle

Roy, Chad J. ; Adams, A. Paige ; Wang, Eryu ; Leal, Grace ; Seymour, Robert ; Sivasubramani, Satheesh K. ; Mega, William ; Frolov, Ilya ; Didier, Peter J. ; Weaver, Scott. / A chimeric Sindbis-based vaccine protects cynomolgus macaques against a lethal aerosol challenge of eastern equine encephalitis virus. In: Vaccine. 2013 ; Vol. 31, No. 11. pp. 1464-1470.
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