Why is this project being done?

The outbreak of Ebola virus disease in West Africa 2014-2016 was estimated by the World Health Organization to have caused more than 10,000 deaths. This outbreak has been caused by a variant of the Ebola virus called the Zaire strain. There is no effective treatment or cure for Ebola and an effective vaccine would be an important step in controlling the spread of disease.
A vaccine is a medical product given to prevent infectious diseases by stimulating the human body to form a protective response against the infection. This protective response is called the immune response, and it is our body’s way of fighting diseases.
EBOVAC 2 (Phase 2 clinical studies) has been selected by the Innovation Medicines Initiative Ebola+ programme to expedite the vaccine regimens development.

How do the EBOVAC trials differ from other ongoing trials?

The heterologous two-dose prophylactic vaccination regimen strategy requires two vaccinations with two different vaccines. The advantage of this strategy is the potentially better and more durable immunity. This is original in the Ebola context and different from other ongoing vaccination strategies with only one vaccination.

What is the purpose of the Phase 2 studies?

The main objective of EBOVAC2 is to provide extensive and robust data on the safety and immunogenicity of the Ad26.ZEBOV and MVA-BN-Filo vaccine regimen. The immune response of different vaccine schedules for prevention of the Ebola virus infection will be compared. The same vaccines are used for all schedules, except that the timing of the second dose vaccination is different.

Who are the volunteers?

In Europe: healthy adults aged 18 to 65 years. In Africa: volunteers include healthy adults and elderly aged up to 70, HIV positive adults and healthy children and adolescents aged 1 to 17 years.

Who is undertaking the trials?

The phase 2 studies in Europe and Africa are sponsored by Janssen Vaccines & Prevention B.V., and coordinated by Inserm.

What is known about these vaccines?

The experimental vaccines used in this study are called Ad26.ZEBOV and MVA-BN-Filo.
Ad26.ZEBOV is a vaccine regimen designed to provide active specific acquired immunity to the Ebola virus (formerly known as Zaire ebolavirus). MVA-BN-Filo® is a vaccine preparation designed to provide active acquired immunity to the Sudan virus, the Ebola virus, the Marburg virus, and the Tai Forest virus (formerly known as Côte d’Ivoire ebolavirus).
Ad26.ZEBOV and MVA-BN®-Filo® have been studied in animals and are well tolerated so far. The vaccines are currently being tested in Phase 1 studies in healthy volunteers in the US, the UK and Africa. Immunizing with these vaccines is expected to stimulate the body’s immune system and may provide protection against infection with the Ebola virus.
In July 2020, the European commission has granted Marketing authorization under exceptional circumstances for the heterologous two-dose vaccine regimen by Janssen for the prevention of the Ebola Virus Disease.

Could the vaccine infect trial participants with Ebola?

No, these vaccines will not cause Ebola infection. The genetic material contained in the investigational vaccine cannot cause someone to become infected with the Ebola virus. Trial participants that have received the investigational vaccines will develop antibodies against this genetic material, but this does not mean that they have been infected.

How long is the study?

Participants receiving the study vaccines will be involved in the study for about 1 year, while those receiving the placebo will be in the study for approximately 10 to 18 weeks.

Will participants have side effects from participating in the studies?

The well-being and safety of study participants is always our top priority. The Phase 2 study protocols are being reviewed by appropriate regulatory authorities and ethics committees. These reviews are done to help ensure that the study would be scientifically, ethically, and clinically appropriate and that it would adhere to accepted standards for protecting human clinical research participants. However, some participants may experience side effects. A number of safety features are built into the study’s design, including daily and weekly reviews of patient data by clinical staff and the study protocol team.

See EBOVAC1 and EBOVAC3 website for more information.


  • Ebola: background

    What is Ebola?

  • Phase 2 trials

    Find out more about EBOVAC2 trials

  • Work programme

    EBOVAC2 is organised into 6 workpackages (WP)

  • Ebola+ programme

    Contributes to efforts to tackle a wide range of challenges in Ebola research

This project has received funding from the Innovative Medicines Initiative 2 Joint Undertaking under grant agreement No. 115861.
This Joint Undertaking receives support from the European Union’s Horizon 2020 research and innovation programme and EFPIA

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