Phenotypic analysis of yellow fever virus derived from complementary DNA

R. S. Marchevsky, J. Mariano, V. S. Ferreira, E. Almeida, M. J. Cerqueira, R. Carvalho, J. W. Pissurno, A. P.A. Travassos da Rosa, M. C. Simoes, C. N.D. Santos, I. I. Ferreira, I. R. Muylaert, G. F. Mann, C. M. Rice, R. Galler

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A thorough phenotypic characterization of yellow fever (YF) virus generated from cDNA is a necessary prerequisite for mapping virulence/attenuation determinants and exploring the potential of YF attenuated virus 17D as a carrier for heterologous protective epitopes. In this study, YF virus was produced from 17D cDNA clones after lipofectin- mediated RNA transfection of certified primary cultures of chicken embryo fibroblasts (YFiv5.2/SL). This virus was passaged once in embryonated chicken eggs according to current YF vaccine manufacture methodology to produce the experimental virus (YFiv5.2/VL). These viruses were characterized in established monkey neurovirulence safety tests and quantitative clinical and histologic scores were derived for each virus. The experimental vaccine viruses (YFiv5.2/SL and VL) compared favorably with another well-known YF vaccine strain (17DD) used as control virus for the histologic score. Although slightly higher clinical neurovirulence was observed for YFiv5.2 as compared with the 17DD virus, it should not preclude the use of YFiv5.2 for mapping YF virus virulence determinants.

Original languageEnglish (US)
Pages (from-to)75-80
Number of pages6
JournalAmerican Journal of Tropical Medicine and Hygiene
Issue number1
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Parasitology
  • Virology
  • Infectious Diseases


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