This is a Phase 1, randomized, double-blind trial of 60 evaluable males and non-pregnant females, 18-45 years old, inclusive, who are in good health, meet all eligibility criteria, and do not meet any exclusion criteria. This trial is designed to assess the safety, reactogenicity and immunogenicity of an Ebolavirus Zaire (ChAd3-EBO-Z) vaccine for the prevention of Ebola. ChAd3-EBO-Z will be administered intramuscularly into the deltoid of all participants on Day 1. On Day 8, subjects will receive either placebo, ChAd3-EBO-Z , or MVA- BN(R)-Filo boosters, administered intramuscularly into the deltoid of the arm opposite their first vaccination, based on study group. There will be 20 subjects in each group. Subjects will be monitored for 6 months after vaccination to assess safety and efficacy for ChA3d-EBO-Z with homologous and heterologous boosting. Differences between the homologous and heterologous arm represent potential points for further, more in depth assessment to determine if there is a correlation with efficacy. Long term goals include comparing results from this study with results from naturally infected individuals as well as non-human primate (NHP) vaccination/challenge studies. There is no formal hypothesis for this study. The primary objective of this study is to assess the safety and reactogenicity of study products by study group when administered IM to healthy adults. The secondary study objective is to assess the antibody response to Zaire ebolavirus (EBOV) glycoprotein (GP) by study group.
This initial, proof of concept study will focus on identifying significant differences in response to the Ebolavirus Zaire vaccine (ChAd3-EBO-Z) when administered with placebo, MVA-BN(R)-Filo, or ChAd3-EBO-Z boosters after 8 days. All 60 participants will receive the ChAd3-EBO-Z vaccine and then randomized into each booster group (20 receiving each type of booster). Subjects will be followed-up for 6 months to monitor for safety outcomes and efficacy measures. There is no formal hypothesis for this study. The primary objective of this study is to assess the safety and reactogenicity of study products by study group when administered IM to healthy adults.