New HIV vaccine candidate enters early safety testing
NCT ID NCT05423418
First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study tested an experimental HIV vaccine in 65 healthy adults to see if it is safe and triggers an immune response. The vaccine includes two HIV proteins (A244 and B.63521) plus an adjuvant (ALFQ) to boost the immune system. Participants received three shots over two months, with different doses of the adjuvant to find the best balance of safety and immune reaction.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- HIV vaccine (A244 and B.63521 proteins) with ALFQ adjuvant
- What this could lead to
- If successful, this could help determine the best dose of ALFQ adjuvant for an HIV vaccine, moving us closer to an effective preventive shot.
- What could go wrong
- This is an early phase 1 trial with only 65 healthy, low-risk participants. It focuses on safety and immune response, not on preventing HIV infection. The vaccine may not produce strong enough immunity or could have side effects.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
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65 people
The number who actually took part.
- Started
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Sep 2022
- Finished
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Oct 2024
- Lead sponsor
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A government agency
The lead sponsor is a US federal agency other than the NIH.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 55 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. Healthy adults between the ages 18-55 years (inclusive) 2. Must be at low risk for HIV infection per investigator assessment and using the study risk assessment tool. 3. Able and willing to provide written, informed consent 4. Able and willing to comply with all research requirements, in the opinion of the Investigator 5. Agreement to refrain from blood donation during the course of the study 6. Minimum body weight of 110 pounds (lbs) (50kg) 7. Laboratory Criteria within 30 days before enrollment: 1. Hemoglobin ≥ 12.0 g/dL for women; ≥ 12.5 g/dL for men 2. White Blood Cell count = 3,500-10,800 cells/mm3 3. Platelets ≥140,000/mm3 and ≤ 450,000/mm3 4. Alanine aminotransferase (ALT; SGPT) \<1.25 x Upper Limit of Normal (ULN) 5. Serum creatinine ≤ 1.25 x institutional upper limit of the reference range 6. Negative HIV testing (HIV Ab / antigen 4th generation screen with reflex confirmatory RNA testing) 7. Negative HBsAg and hepatitis C antibody testing Note: As above, Grade 1 lab abnormalities detected on screening may be repeated at PI discretion. Persistent Grade 1 abnormalities that are felt to represent the non-pathologic baseline for the subject will be documented before a subject is enrolled in the trial and are allowable per discretion of the PI. 8. Birth control requirements: All participants assigned female at birth must meet one of the following 2 criteria: 1. No reproductive potential due to post-menopausal status (12 months of natural \[spontaneous\] amenorrhea) or hysterectomy, bilateral oophorectomy, or tubal ligation 2. People of childbearing potential should agree to practice highly effective contraception at least 30 days before enrollment and through 3 months post-last vaccination, using one of the following methods: condoms (male or female) with spermicide; diaphragm, or cervical cap with spermicide; intrauterine device; contraceptive pills, patch, injection, intravaginal ring or other FDA-approved contraceptive method; male partner has previously undergone a vasectomy; abstinence 3. All participants are encouraged to engage in safe sex practices to prevent HIV acquisition 9. For all participants assigned female at birth, except those with a history of hysterectomy or bilateral oophorectomy, a negative β-human chorionic gonadotropin (HCG) pregnancy test (urine) on the day of enrollment and each vaccination day is required. Because tubal ligations have a failure rate that is not insignificant, and because 12 months of spontaneous amenorrhea can be a result of polycystic ovarian syndrome and does not completely preclude pregnancy, a negative β- HCG pregnancy test at enrollment and on each vaccination day is also required for participants assigned female at birth with a history of either of these). 10. No plans to travel outside the Washington DC metro area (DC, Maryland, and Virginia) that would prevent compliance with planned study visits 11. Test of Understanding (TOU) (minimum passing score of 80% with 2 attempts permitted) Exclusion Criteria: 1. Receipt of any investigational HIV vaccine or investigational adjuvant 2. Received an investigational product in the 30 days before enrollment, or planned to receive during the study period. This does not include products with emergency use authorization. 3. Concurrent participation in another clinical research study 4. Any serious medical illness or condition 5. Receipt of immunoglobulins or blood products within 3 months before enrollment 6. Any history of anaphylaxis or allergy to study product 7. History of sickle cell trait or disease 8. Pregnancy, lactation, or intention to become pregnant during the study 9. History of active/recent cancer still within treatment or active surveillance follow-up (except basal cell carcinoma of the skin and cervical carcinoma in situ). Treated/resolved cancers with no likelihood of recurrence may be deemed acceptable at Principal Investigator (PI) discretion. 10. History of autoimmune disease 11. History of Potentially Immune-Mediated Medical Conditions (PIMMCs) 12. Suspected or known current alcohol or drug abuse as defined by an alcohol intake of greater than 3 drinks a day on average for a man, and greater than 2 drinks a day on average for a woman 13. Any other significant disease, disorder or finding which may significantly increase the risk to the volunteer because of participation in the study, affect the ability of the volunteer to give informed consent, participate in the study, or impair interpretation of the study data, in the opinion of the Investigator 14. History of splenectomy 15. History of confirmed or suspected immunodeficiency 16. History of hereditary angioedema (HAE) acquired angioedema (AAE), or idiopathic forms of angioedema 17. History of asthma that is unstable or required emergent care, urgent care, hospitalization, or intubation during the past 2 years 18. History of diabetes mellitus (type I or II), with the exception of gestational diabetes 19. History of thyroid disease (except for well controlled hypothyroidism) 20. History of idiopathic urticaria within the past year 21. History of hypertension that is not well controlled by medication or that is persistently greater than 140/95 at screening 22. History of bleeding disorder diagnosed by a doctor (e.g., factor deficiency, coagulopathy, or platelet disorder requiring special precautions) or significant bruising or bleeding difficulties with IM injections or blood draws 23. History of chronic or active neurologic disease to include seizure disorder and chronic migraine headaches. Exceptions are: i) childhood febrile seizures, or ii) seizures secondary to alcohol withdrawal more than 3 years ago 24. Subjects receiving any of the following substances: 1. Systemic immunosuppressive medications or cytotoxic medications within 12 weeks before enrollment \[with the exception of a short course of corticosteroids (≤ 14 days duration or a single injection) for a self-limited condition at least 2 weeks before enrollment; inhaled, intranasal or topical steroids are not considered exclusionary 2. Treatment with known immunomodulators including allergy immunotherapy (other than nonsteroidal anti-inflammatory drugs \[NSAIDs\] or stable maintenance immunotherapy (doses not in the process of being increased), at the discretion of the Protocol Safety Review Team (PSRT)) for any reason 3. Live attenuated vaccines within 30 days before initial study vaccine administration 4. Medically indicated subunit, messenger ribonucleic acid (mRNA), or killed vaccines, e.g., influenza, pneumococcal, vaccines with Quillaja saponaria-21 (QS-21) as an adjuvant, or allergy treatment with antigen injections, planned for administration 14 days before or after study vaccine administration 25. History of arthritis diagnosis other than osteoarthritis 26. History of other diagnosed rheumatoid disorders 27. Has an acute illness or temperature ≥38.0 degrees Celsius (C)/100.4 degrees Fahrenheit (F) on any study injection day or within 48 hours of planned study injection. Note: Participants will not be excluded from further consideration for enrollment and study injections. Volunteers with fever or an acute illness on the day of study injection or in the 2 days before the study injection may be re-assessed by a study physician for resolution of the condition and enrolled and receive the study injection so long as the injection is within allowable windows. Military personnel will be excluded from participation in this study, regardless of leave status due to the potential for a false-positive HIV test result on mandatory HIV testing. This could have adverse effects on deployment status. Final evaluation of eligibility will be based on the medical judgment of the investigator based on his/her medical and research experience.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Walter Reed Army Institute of Research, Clinical Trials Center
Silver Spring, Maryland, 20910, United States
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