A Study to Evaluate the Safety and Immunogenicity of a Candidate Ebola Vaccine in Children

The purpose of this study is to assess the safety and reactogenicity of a single IM dose of the GSK3390107A (ChAd3 EBO-Z) vaccine, overall and in children aged 1 to 5, 6 to 12, and 13 to 17 years, separately.

Considering the risk of exposure to Ebola and the potential (based on animal data) for the investigational GSK3390107A (ChAd3-EBO-Z) vaccine to afford at least partial protection, all children in the study will receive the investigational GSK3390107A (ChAd3 EBO-Z) vaccine. The children in the Group GSK3390107A+Nimenrix will receive the investigational GSK3390107A (ChAd3-EBO-Z) vaccine at Day 0 of the study, whereas the children in the Group Nimenrix+GSK3390107A will receive Nimenrix at Day 0 (as a control). At Month 6, the children in the Group Nimenrix+GSK3390107A will receive the investigational GSK3390107A (ChAd3-EBO-Z) vaccine (provided that no safety concerns are raised), whereas the children in the Group GSK3390107A+Nimenrix will receive Nimenrix.


Eligibility Criteria:
Inclusion Criteria:

* Subject's parent(s)/ legally acceptable representative(s) (LAR\[s\]) who, in the opinion of the Investigator, can and will comply with the requirements of the protocol (e.g. availability for Diary Card completion, return for follow-up visits, availability for clinical follow-up throughout the study period).
* Written/ thumb printed informed consent obtained from the subject' parent(s)/ LAR\[s\] prior to performing any study specific procedure. In addition, written/ thumb printed in-formed assent should be obtained if appropriate (from all subjects aged 13 to 17 years and from younger subjects as per local requirements).
* A male or female child aged 1 to 17 years inclusive at the time of Screening.
* Subjects with a negative RDT test for Malaria within 30 days prior to randomisation into the study.

OR Subjects with a positive RDT test for Malaria who completed antimalarial treatment at least 5 days prior to randomisation into the study.

* Healthy subjects as per Investigator judgement, as estab-lished by medical history, clinical examination and haema-tology/ biochemistry laboratory parameters screening be-fore entering into the study.
* Female subjects of non-childbearing potential may be enrolled in the study.

  * Non-childbearing potential is defined as pre-menarche or ovariectomy.
* Female subjects of childbearing potential may be enrolled in the study, if the subject:

  * has practiced adequate contraception for 30 days prior to the Day 0 visit, and
  * has a negative pregnancy test at the Day 0 visit, and
  * has agreed to continue adequate contraception until 30 days after the Month 6 visit

Exclusion Criteria:

* Child in care.
* Use of any investigational or non-registered product (drug or vaccine) other than the study vaccine during the period starting 30 days before the Day 0 visit, or planned use during the study period.
* Previous vaccination with an investigational EBOV or Marburg vaccine, or previous vaccination with a chim-panzee adenoviral vectored investigational vaccine.
* Known prior EBOV or SUDV disease.
* Travel to country affected by the EBOV epidemic or direct contact with person with EVD within 21 days prior to the Day 0 visit.
* History of any reaction or hypersensitivity (such as ana-phylaxis, urticaria (hives), respiratory difficulty, angioe-dema, or abdominal pain) likely to be exacerbated by any component of the study vaccine.
* Planned administration/ administration of a vaccine not foreseen by the study protocol in the period starting 30 days before and ending 30 days after each vaccination visit.
* Acute or chronic illness determined by medical history, clinical examination and laboratory screening tests in-cluding, but not limited to:
* Clinically significant immunosuppressive or immunodeficient condition (e.g. clinical acquired immune deficiency syndrome \[AIDS\]).
* Major congenital defects.
* Malnutrition (defined as weight for age Z-score less than -3, or other clinical signs of malnutrition).
* Any clinically significant haematological or biochemical laboratory abnormality.
* Pregnant female.
* Any condition that in the Investigator's opinion may po-tentially compromise subject safety or interfere with sub-ject assessment or compliance.