ART4 and Ebola hemorrhagic fever: To assess the induction of serum IgG titers by our vaccine candidates, Balb/c mice were immunized intramuscularly with an escalating dose (10 fold increase per step, range 107 to 1010 vector particles (vp)) of each of the rAd26 and rAd35 vectors with the glycoprotein of Ebola Zaire, Ebola Sudan/Gulu, Ebola Ivory coast, Marburg Angola, or Marburg Ravn as a transgene.