Clinical Research Directory

Inclusion Criteria: * A contact of a newly confirmed Bundibugyo virus disease (BVD) index case, occurring within the previous 21 days of enrollment. A contact is defined as a person who, within the previous 21 days, lived in the same household as the index case; OR visited or was visited by the index case at or after the onset of symptoms; OR, without using adequate personal protective equipment, provided the index case with care, was in close physical contact with the patient's body, body fluids, linen or clothes, or prepared the body for, or was exposed to the body at, a funeral ceremony. * Adults, adolescents, and children aged 1 year and older at the time of enrollment. Where a candidate vaccine has an age indication that does not cover the full age range, enrollment for that candidate is limited to its age indication and compared with the same age group in the comparator arm. The lower age limit for any age band is determined by the age indication of both the candidate vaccine and the comparator. * Capable of giving written informed consent, or having a parent, legal guardian or legally authorized representative capable of giving written informed consent on the participant's behalf, in accordance with applicable country regulations. Where permitted by local regulations, witnessed verbal consent may be obtained for participants unable to provide written consent, documented in the presence of an impartial witness independent of the study team. Participants for whom assent is required under local regulations or ethics committee requirements must additionally provide informed assent. * Willing to provide verifiable identification, such as iris scanning or a participant card where feasible, and able to be contacted by telephone number or address. Exclusion Criteria: * History of laboratory-confirmed Bundibugyo virus disease. * Previous vaccination against Bundibugyo virus. Note: prior receipt of an Ebola or Marburg investigational or licensed vaccine is non-exclusionary provided that any prior vaccination was administered more than 28 days before enrollment and is documented. * History of anaphylaxis from a vaccine or a component of a vaccine. * Acute unstable illness at the time of vaccination, including organ failure, severe ongoing infection, or any acute condition requiring hospitalization. * Receipt of monoclonal antibodies as post-exposure prophylaxis (PEP) within 21 days prior to vaccination, or planned receipt after vaccination. * Ongoing treatment with antiviral PEP from at least six days prior to vaccination until the time of vaccination. Note: prior receipt of a licensed or experimental antiviral candidate for BVD PEP is acceptable provided the course was completed at least six days prior to vaccination. * Use of any other experimental drug, other than antivirals or monoclonal antibodies used for BVD prophylaxis, within 28 days prior to vaccination. * Currently enrolled in, or planning to participate in, another investigational or interventional study during this study. Observational and registry studies are permitted. * Living in an area deemed inaccessible by the Investigator, for reasons of distance or security. Inaccessibility is defined as: no usable road or river access for the vehicles available to the team; or an active security incident or armed clash affecting the locality within the preceding 7 days, or a formal instruction from local authorities not to deploy. * Symptoms consistent with BVD at screening, defined as sudden onset of fever (measured or reported, 38.0 degrees Celsius or above); OR inexplicable bleeding; OR at least three of the following: headache, lethargy, anorexia or loss of appetite, aching muscles or joints, stomach pain, difficulty swallowing, vomiting, difficulty breathing, diarrhea, hiccups.