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HDT 321

Phase 1

Vaccine | Monoclonal antibody | Infectious Disease |Quest Diagnostics Inc.|Last Updated: Jul 28, 2025

Success Probability
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Market & Valuation
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Trial Design
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment48
FDA Designations
No designations recorded
Clinical trial landscape

HDT 321 · 1 trial · 2 indications

Phase 1 1
NCT06799013Safety and Immunogenicity of a Self-Amplifying RNA Vaccine Against Crimean-Congo Hemorrhagic FeverVaccine
RECRUITING48 Analytics
PHASE1RECRUITING
Safety and Immunogenicity of a Self-Amplifying RNA Vaccine Against Crimean-Congo Hemorrhagic Fever
VaccineUnlock trial analytics
Study Endpoints
Primary Endpoints
Solicited local and systemic adverse events (AEs)
Day 1-7 post administration

Frequency and grade of solicited local and systemic AEs during the 7-day follow-up period after each study injection (i.e. the day of administration and 6 subsequent days).

Unsolicited study product related adverse events
Day 1-28 post administration

Frequency and grade of unsolicited study product related AEs reported during the 28-day follow-up period after each study injection.

Laboratory abnormalities
Day 1-7 post administration

Occurrence of laboratory abnormalities at 7 days post injection visit (increased or decreased outside normal ranges, as determined by the FDA Guidance for Industry Toxicity Grading Scale for Healthy Adults Enrolled in Preventive Vaccine Clinical Trials, 2007)

Serious AEs, AEs of Special Interest, Medically Attended AEs, and New-Onset of Chronic Diseases
Day 1 to end of study participation (Day 394)

Frequency and grade of Serious AEs (SAEs), AEs of Special Interest (AESIs), Medically-Attended AEs (MAAEs), and New-Onset of Chronic Diseases (NOCDs) during the duration of participation in the study.

Secondary Endpoints
Immunogenicity of HDT-321
Day 1 to Day 57
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposePREVENTION
Treatment Arms
ArmTypeDescription
Group 1EXPERIMENTALGroup 1 will include 12 participants who will receive a 10 ug two dose schedule of HDT-321 at day 1 and day 29.
Group 2EXPERIMENTALGroup 2 will include 12 participants who will receive a 25 ug, two dose schedule of HDT-321 at day 1 and day 29.
Group 3EXPERIMENTALGroup 3 will include 12 participants who will receive a 50 ug one dose schedule of HDT-321 at day 1.
Group 4EXPERIMENTALGroup 4 will include 12 participants who will receive a 50 ug two dose schedule of HDT-321 at day 1 and day 29.
Interventions
NameTypeDescription
10 ug HDT 321BIOLOGICALHDT-321 Investigational Vaccine (a Nanoparticle Carrier-Formulated self-amplifying RNA encoding the NP of CCHFV)
25ug HDT-321BIOLOGICALHDT-321 Investigational Vaccine (a Nanoparticle Carrier-Formulated self-amplifying RNA encoding the NP of CCHFV)
50ug HDT-321BIOLOGICALHDT-321 Investigational Vaccine (a Nanoparticle Carrier-Formulated self-amplifying RNA encoding the NP of CCHFV)
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Eligibility Criteria
Age Range18 Years to 64 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: 1. Males and non-pregnant females 18 to 64 years of age at the time of signing the ICF. 2. Body mass index (BMI) 17 to 35 inclusive at screening. 3. Considered by the PI or designee to be in good general health as determined by medical history, physical examination, vital sign m...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 24, 2026NCT06799013studyFirstPostDate: changed