Protection of hamsters by Venezuelan equine encephalitis virus candidate vaccine V3526 against lethal challenge by mosquito bite and intraperitoneal injection.
In an attempt to improve the current live, attenuated vaccine (TC-83) for Venezuelan equine encephalitis virus (VEEV), specific mutations associated with attenuation of VEEV in rodent models were inserted into a full-length cDNA clone of the Trinidad donkey strain of VEEV by site-directed mutagenesis. Because some viruses have been reported to be more pathogenic when introduced by mosquito bite than the same virus introduced by needle inoculation, there were concerns that the presence of mosquito saliva, or changes in the virus caused by replication in a mosquito, might allow the virus to overcome the protective effects of prior vaccination with V3526. Therefore, we determined if hamsters vaccinated with V3526 were protected from challenge with the virulent Trinidad donkey strain of VEEV. All non-vaccinated hamsters died after intraperitoneal challenge or after being fed on by VEEV-inoculated Aedes taeniorhynchus. In contrast, hamsters vaccinated with V3526 were resistant to intraperitoneal challenge and infection by VEEV-infected Ae. taeniorhynchus. Therefore, the V3526 candidate vaccine elicits protection against VEEV infection by mosquito bite.
Turell
Michael J
MJ
Virology Division, US Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland 21702-5011, USA. michael.turell@amedd.army.mil
Parker
Michael D
MD
D000330:Aedes / Q000821:virology*; D000818:Animals; D001831:Body Temperature / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D002522:Chlorocebus aethiops; D006224:Cricetinae; D004195:Disease Models, Animal; D004666:Encephalitis Virus, Venezuelan Equine / Q000276:immunology* / Q000472:pathogenicity; D004685:Encephalomyelitis, Venezuelan Equine / Q000517:prevention & control*; D005260:Female; D007274:Injections, Intraperitoneal; D007299:Insect Bites and Stings; D007303:Insect Vectors / Q000821:virology*; D013997:Time Factors; D014613:Vaccines, Attenuated / Q000008:administration & dosage; D014709:Vero Cells; D014765:Viral Vaccines / Q000008:administration & dosage
D014613:Vaccines, Attenuated; D014765:Viral Vaccines