Safety, Tolerability, and Immunogenicity of ALFQ in a HIV Vaccine Containing A244 and B.65321 in Healthy Adults

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:

8. Birth control requirements: All participants assigned female at birth must meet one of the following 2 criteria:

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)

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:

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.