A Phase 1 interventional study of rVSVΔG-SUDV-GP and Placebo in Sudan Virus Disease, sponsored by International AIDS Vaccine Initiative. Recruiting at 3 sites in United States. Open to participants aged 18 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-21.
Sponsored by International AIDS Vaccine Initiative · Phase 1, Interventional, and Prevention
A Clinical Study to Investigate the Safety and Immunogenicity of rVSV∆G-SUDV-GP, a Sudan Virus (SUDV) Vaccine for the Prevention of SUDV Disease in Adults in Good General Health.
This is a Phase 1, Randomized, Observer-blind, Placebo-controlled, Dose-escalation Clinical Trial to Evaluate the Safety and Immunogenicity of rVSVΔG-SUDV-GP Vaccine in Adults in Good General Health. Participants will be screened up to 28 days before Investigational Product (IP) administration and will be followed for 6 months after IP administration. The study will evaluate 4 different dose levels (2 X106 1X107, 2 X 107, 5 X 107) in 4 different participant groups for which enrollment will initiate sequentially. Starting with the lowest dose group, four sentinel participants will be enrolled in a sequential manner with no more than one participant enrolled across all sites per day. A safety review will be performed by the Sponsor after enrollment of the fourth sentinel participant, after which point the remainder of participants will be enrolled in group 1. In addition, a safety assessment will be performed by the Sponsor before opening enrollment in group 2. This assessment will be performed after enrollment of the 9th participant in group 1. The same sentinel dosing followed by safety reviews approach will be repeated for each group at each dose level.[
656 studies on the registry are indexed under Virus Diseases; 85 are open to participants now.
This study's planned enrollment of 112 is above the median of 100 across 464 interventional studies indexed under Virus Diseases.
Browse Virus Diseases studies →International AIDS Vaccine Initiative is the lead sponsor of 37 studies on the registry; 5 are open to participants now.
Of its 8 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
Compared within Virus Diseases, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Infections. The counts are of registry records indexed under each term, refreshed daily. How we classify →
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria
Any abnormality on history or examination including:
history of immunodeficiency or disease history of splenectomy history of in the past 5 years use of , , anticancer, or other medications considered significant by the Investigator within the previous 6 months (BMI) ≥ 35.0 kg/m2
Current or planned occupational (medical care, childcare) or household contact (residing in the same household) from screening through 3 months after IP administration with any individual at increased risk from exposure to a live viral vaccine including infants ≤ 1 year of age, adults
≥75 years of age, or immunocompromised individuals.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Live vaccines
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
rVSVΔG-SUDV-GP
Biological: rVSVΔG-SUDV-GP
Placebo/Diluent
Other: Placebo
rVSVΔG-SUDV-GP
Placebo
Safety and tolerability of rVSVΔG-SUDV-GP vaccination: solicited reactogenicity
Occurrence, onset, duration, and severity of local and systemic solicited adverse events within 14 days following vaccination
Time frame: 14 Days
Safety and tolerability of rVSVΔG-SUDV-GP vaccination: unsolicited reactogenicity
Occurrence, onset, duration, severity, and relationship to IP of unsolicited adverse events, including safety laboratory parameters, within 28 days following vaccination
Time frame: 28 Days
Safety and tolerability of rVSVΔG-SUDV-GP vaccination: SAEs and AESIs
Occurrence, onset, duration, severity, and relationship to IP of SAEs and AESIs throughout the study period
Time frame: 7 Months
SUDV-GP-specific serum antibody responses
Proportion of participants with binding antibody responses to SUDV-GP
Time frame: Throughout the study, up to 6 months after immunization
SUDV-GP-specific serum antibody responses magnitude and duration
Magnitude and duration of binding antibody to SUDV-GP throughout the full study period (1 week, 2 weeks, 4 weeks, 2 months, 3 months, 6 months after immunization)
Time frame: Throughout the study, up to 6 months after immunization
SUDV-GP-specific serum antibody neutralization
Proportion of participants with neutralizing antibody against Sudan virus as measured by PRNT assay
Time frame: Throughout the study, up to 6 months after immunization
SUDV-GP-specific serum antibody magnitude and duration of neutralization
Magnitude and duration of neutralizing antibody against Marburg virus as measured by PRNT assay throughout the full study period (1 week, 2 weeks, 4 weeks, 2 months, 3 months, 6 months after immunization)
Time frame: Throughout the study, up to 6 months after immunization
Plan to share: Undecided — IPD sharing plans are currently under internal discussion.
No publications or documents are linked to this record.
Started May 2026 (actual). Primary completion is estimated for Apr 2027, 11 months after the start.
Of 58 phase 1 interventional studies under Virus Diseases, half reached primary completion within 24 months of starting (the median), counting those still running; a quarter within 15 and three quarters within 43. This study's planned 11 months is below that.
How these figures are worked out, and which studies are left out of them.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
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International AIDS Vaccine Initiative