Recombinant chimeric virus with wild-type dengue 4 virus premembrane and envelope and virulent yellow fever virus Asibi backbone sequences is dramatically attenuated in nonhuman primates.
Candidate vaccine ChimeriVax viruses are attenuated, efficacious, safe, and highly unlikely to be transmitted by arthropod vectors. Nevertheless, concerns have been raised about the use of these vaccines because of the potential for recombination between vaccine and wild-type (WT) strains. To evaluate the vertebrate pathogenicity of such a worst-case recombinant, ChimeriVax-dengue (DEN) 4 virus was chimerized with the WT Asibi yellow fever virus. In this worst-case scenario, chimeric viruses remained fully attenuated in nonhuman primates. We therefore conclude that, even in the highly unlikely event of "virulent" backbone reversion, the safety of ChimeriVax-DEN vaccines would not be compromised.
McGee
Charles E
CE
Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555-0609, USA. cemcgee@utmb.edu
Lewis
Mark G
MG
Claire
Marisa St
MS
Wagner
Wendeline
W
Lang
Jean
J
Guy
Bruno
B
Tsetsarkin
Konstantin
K
Higgs
Stephen
S
Decelle
Thierry
T
D000818:Animals; D002678:Chimera / Q000235:genetics / Q000821:virology; D003715:Dengue / Q000635:transmission / Q000662:veterinary; D003716:Dengue Virus / Q000276:immunology / Q000472:pathogenicity*; D004195:Disease Models, Animal; D005260:Female; D008252:Macaca fascicularis / Q000821:virology; D008297:Male; D014613:Vaccines, Attenuated / Q000009:adverse effects* / Q000235:genetics; D053060:West Nile Virus Vaccines / Q000008:administration & dosage* / Q000276:immunology; D015004:Yellow Fever / Q000235:genetics / Q000276:immunology* / Q000662:veterinary; D022341:Yellow Fever Vaccine / Q000008:administration & dosage* / Q000235:genetics; D015005:Yellow fever virus / Q000472:pathogenicity*
C445780:ChimeriVax; C528874:ChimeriVax-DEN4 vaccine; D014613:Vaccines, Attenuated; D053060:West Nile Virus Vaccines; D022341:Yellow Fever Vaccine