Partnership for Research on Ebola Vaccines in Liberia (PREVAIL)
Partnership for Research on Ebola Vaccines in Liberia (PREVAIL)
Background:

 - Ebola virus disease (EVD) affects many people in Liberia and other countries in West
 Africa. It is caused by the Ebola virus and makes people sick with fever, headache, vomiting,
 diarrhea, rash, and bleeding. About half the people with EVD die. There is no approved
 treatment for it. Researchers are studying two Ebola vaccines. The vaccines do not cause
 Ebola.

 Objectives:

 - To study the safety and efficacy of two Ebola vaccines.

 Eligibility:

 - Adults 18 and older who live in Liberia and are at risk for Ebola infection but have never
 had Ebola.

 Design:

 -  Participants will give information including birthdate, gender, occupation, and location
 of home. They will give contact information for themselves and 2 alternate contacts.
 They will give a history of their contact with people with Ebola. Some participants may
 have a physical. They may have blood taken.

 -  Participants will be injected with either an Ebola vaccine or a placebo with a needle in
 the upper arm. The placebo is a salt solution.

 -  Participants will have blood taken.

 -  Participants will be watched for 30 minutes.

 -  Participants will return to the clinic 1 week and 1 month after they get the shot. They
 will have blood taken.

 -  After that, participants will be contacted monthly to discuss how they are feeling. They
 may be contacted by phone, may visit the clinic, or may have a home visit.

 -  The study ends 8-12 months after participants get the shot. If one of the vaccines works
 against Ebola and does not have many side effects, participants can get the vaccine if
 they did not get it in the study.
Ebola virus disease (EVD) in West Africa is spreading rapidly, and there is a critical need
 for a vaccine to prevent EVD. There are two candidate Ebola virus vaccines, the chimpanzee
 adenovirus 3 (ChAd3-EBO Z)-based vaccine and the Vesicular Stomatitis virus
 (VSVdeltaG-ZEBOV)-based vaccine. This study will evaluate both of these vaccines in a
 randomized, double-blind, controlled, 3-arm study in Liberia. Each vaccine will be compared
 against the same active control. Because there are limited data on the safety of these
 vaccines, the initial phase (phase 2) of the study will include the collection of more
 detailed data on safety and will define the immune response elicited by each vaccine in the
 first 600 volunteers. With the decline in new cases of Ebola virus infection the phase 3
 component was no longer deemed to be feasible and, following safety, ethical and FDA
 approve/concurrence, the study was amended to a more robust, 1,500 person phase 2 design.

 With the amendment to only a phasae 3 study the endpoint reverted to the phase 2 endpoint of
 safety and immunogenicity.

 Participants aged 18 year and older will be enrolled at health clinics in Monrovia, Liberia
 over 4 months. A single dose of the assigned agent will be administered. Participants in
 phase 2 will undergo blood draw and assessment of adverse events (AEs) and signs and symptoms
 of Ebola infection at 1 week and 1 month after vaccination, and monthly assessment of AEs and
 signs and symptoms of Ebola thereafter. Participants in phase 3 will undergo monthly
 assessment of AEs and signs and symptoms of Ebola infection after vaccination. All
 participants will be followed for 8 to 12 months.

 This clinical trial to evaluate vaccine efficacy will provide an accurate assessment of the
 benefits and risks associated with each candidate vaccine and inform policy on wider scale
 vaccination in other countries.
-  INCLUSION CRITERIA:

 The inclusion criteria for the study are broad reflecting the target population that would
 eventually receive an efficacious vaccine.

 -  Informed consent

 -  Age greater than or equal to 18 years

 -  Likely to be in the surrounding area of the vaccination center for at least one year.

 EXCLUSION CRITERIA:

 -  Fever greater than or equal to 38.0 degrees Celsius

 -  History of EVD (self-report)

 -  Current pregnancy (a negative urine pregnancy test is required for women of
 child-bearing potential)

 -  Breast-feeding an infant

 -  Any condition which would limit the ability of the participant to meet the
 requirements of the study protocol