Clinical Trial to Evaluate the Safety and Immunogenicity of the V2 Apex-Directed Immunogens DV201P-RNA and DV202B1-RNA in Adult Participants Without HIV

1. Women who are breastfeeding or pregnant.

2. Body mass index (BMI) ≥40. Enrollment of individuals with BMI ≥40 who are in good health, as assessed by the site investigator, may be considered by PSRT approval.

3. Diabetes mellitus (DM). Type 2 DM controlled with diet alone (and confirmed by HgbA1c ≤8% within the last 6 months) or a history of isolated gestational diabetes are not exclusionary. Enrollment of individuals with type 2 DM that is well controlled on hypoglycemic agent(s) may be considered by the PSRT on a case-by-case basis, provided that the HgbA1c is ≤8% within the last 6 months (sites may draw these at screening).

4. Previous or current recipient of an investigational HIV vaccine (previous placebo/control recipients are not excluded).

5. Receipt of non-HIV investigational vaccine(s) received within the last 1 year. Exceptions include vaccines that have subsequently undergone licensure or Emergency Use Authorization (EUA) by the FDA or World Health Organization (WHO) Emergency Use Listing (EUL), or if outside the US, by the national Regulatory Authority (RA) authorizing this clinical trial.

6. Congenital or acquired immunodeficiency, including systemic medication use likely to impair immune response to vaccine in the opinion of the site investigator, such as glucocorticoid use or prednisone dose of ≥10 mg/day, within 3 months prior to enrollment.

7. Blood products or immunoglobulin within 16 weeks prior to enrollment; receipt of immunoglobulin within 16 weeks prior to enrollment requires PSRT approval.

8. Receipt of any of the following within 4 weeks prior to enrollment:

• Live replicating vaccine

• Any mRNA-based vaccine with FDA licensure, FDA EUA, or WHO EUL

• ACAM2000 vaccine \>28 days prior with a vaccination scab still present

9. Receipt of any vaccine that is not covered in exclusion criterion #8 within 14 days prior to enrollment. Please note this includes replication-incompetent vaccines such as the Jynneos vaccine for the prevention of mpox (formerly known as monkeypox) disease.

10. History of myocarditis and/or pericarditis.

11. Initiation of Ag-based immunotherapy for allergies within the past year (stable immunotherapy is not exclusionary); inclusion of participants who initiated immunotherapy within the previous year requires PSRT approval.

12. Receipt of investigational research agents with a half-life of 7 or fewer days within 4 weeks prior to enrollment. (Receipt of an investigational research agent with a half-life of 7 or fewer days more than 4 weeks prior to enrollment is not exclusionary.) If a potential participant has received investigational agents with a half-life of more than 7 days (or unknown half-life) within the past year, PSRT approval is required for enrollment.

13. History of serious reaction (eg, hypersensitivity, anaphylaxis) to any mRNA vaccine, including Comirnaty (Pfizer) and Spikevax (Moderna), or to any drug administered systemically as a polyethylene glycol containing LNP, including doxorubicin (Doxil, Caelyx, ThermoDox), cisplatin (Lipoplatin), and irinotecan (Onivyde).

14. Hereditary angioedema, acquired angioedema, or idiopathic forms of angioedema.

15. Urticarial episode (idiopathic or known etiology) within the past year.

16. History of chronic urticaria.

17. History of urticaria previously associated with immunization.

18. Bleeding disorder diagnosed by a clinician that would make study procedures a contraindication.

19. History of seizure(s) within the past 3 years. Also exclude if volunteer has used medications in order to prevent or treat seizure(s) at any time within the past 3 years.

20. Asplenia or functional asplenia.

21. Active duty and reserve US military personnel.

22. Any other chronic or clinically significant condition that, in the clinical judgment of the investigator, would jeopardize the safety or rights of the study participant, including but not limited to clinically significant forms of substance use or alcohol use disorder(s), serious psychiatric disorders, any suicide attempt within the past year (if between 1 and 2 years, consult PSRT for approval), or cancer that, in the clinical judgment of the site investigator, has potential for recurrence (excluding basal cell carcinoma).

23. Asthma is excluded if the participant meets any of the following criteria:

• Required either oral or parenteral corticosteroids for an exacerbation 2 or more times within the past year

• Needed emergency care, urgent care, hospitalization, or intubation for an acute asthma exacerbation within the past year (eg, would not exclude individuals with asthma who meet all other criteria but sought urgent/emergent care solely for asthma medication refills or coexisting conditions unrelated to asthma)

• Uses a short-acting rescue inhaler more than 2 days per week for acute asthma symptoms (ie, not for preventive treatment prior to athletic activity)

• Uses medium- to high-dose inhaled corticosteroids (\>250 mcg fluticasone or therapeutic equivalent per day), whether in single-therapy or dual-therapy inhalers (ie, with a long-acting beta agonist \[LABA\])

• Uses more than 1 medication for maintenance therapy daily. Inclusion of anyone on a stable dose of more than 1 medication for maintenance therapy daily for greater than 2 years requires PSRT approval.

24. A participant with a history of a PIMMC, either active or remote. Specific examples are listed in Appendix E (AESI index). Not exclusionary: (1) remote history of Bell's palsy (\>2 years ago) not associated with other neurologic symptoms; (2) mild psoriasis or other mild, uncomplicated, localized, or dermatologic condition that does not require ongoing systemic treatment; (3) remote history (\>10 years ago) of Kawasaki disease without sequelae; (4) celiac disease well controlled for 6 months with diet only.

25. History of allergy to local anesthetic (Novocaine, Lidocaine).

26. Investigator concern for difficulty with venous access based on clinical history and physical examination. For example, persons with a history of intravenous drug use or substantial difficulty with previous blood draws.

What this study is about