This is a Phase 2/3, randomized, double-blind, placebo-controlled, multi-center study to evaluate the safety, tolerability, and efficacy of ADM03820 to prevent symptomatic COVID-19 in adult subjects (≥ 18 years of age).
Approximately 450 subjects will be enrolled in the Phase 2 segment of the study and will be randomized in a 2:1 ratio with a total of 300 subjects receiving ADM03820 and 150 subjects receiving placebo. In the Phase 3 segment, an additional 4,000 subjects will be enrolled and randomized in a 2:1 ratio, for a total sample size (including the Phase 2 subjects) of 4,450 total subjects. The primary objective of the Phase 2 segment is to evaluate the safety and tolerability of ADM03820 in adult subjects. The secondary objectives are to assess safety, PK, immunogenicity, and microneutralization (MN) of ADM03820 and to gather information surrounding COVID-19 incidence rates and COVID-19 symptoms to support Phase 3 assumptions and assessment of efficacy. The primary objectives of the Phase 3 segment are to evaluate the efficacy of ADM03820 for the prevention of symptomatic COVID-19 in adult subjects. The secondary objectives are to evaluate the efficacy of ADM03820 for prevention and amelioration of COVID-19 symptoms, to monitor the incidence and severity of COVID-19, and to evaluate the safety and tolerability of ADM03820.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
QUADRUPLE
Incidence and severity of reactogenicity through Day 7 and adverse events (AEs) through end of study (Phase 2)
Number of participants with AEs and reactogenicity symptoms. FDA Toxicity Grading Scale for Local and General Systemic Reactogenicity will assess severity.
Time frame: 540 days
Incidence of SAEs and medically-attended AEs (Phase 2)
Number of participants with SAEs and medically-attended AEs through end of study
Time frame: 540 days
Occurrence of changes from baseline in physical examination, vital signs, and clinical safety laboratory values (Phase 2)
Number of participants with changes from baseline
Time frame: 365 days
Incidence of symptomatic, virologically confirmed COVID-19 (Phase 3)
Number of participants with symptomatic, virologically confirmed COVID-19
Time frame: Day 1 to Day 29
Incidence of symptomatic, virologically confirmed COVID-19 (Phase 2 and Phase 3)
Number of participants with symptomatic, virologically confirmed COVID-19 through Day 183 (Phase 2) and through Day 57, Day 134, and Day 183 (Phase 3)
Time frame: 183 days
Hospitalization (Phase 2 and Phase 3)
Number of hospitalizations
Time frame: 183 days
All-cause mortality (Phase 2 and Phase 3)
Number of all-cause mortality
Time frame: 183 days
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Incidence of AEs (Phase 2)
Number of participants with AEs through end of the study
Time frame: 540 days
Incidence of SAEs (Phase 2)
Number of participants with SAEs through end of the study
Time frame: 540 days
Incidence of COVID-19 related medically attended events (Phase 2)
Number of participants with events occurring after dosing through end of study
Time frame: 540 days
The assessment of Cmax for each of the monoclonal antibodies of ADM03820 as measured by mAb specific enzyme-linked immunosorbent assay (ELISA) (Phase 2)
Pre-dose and on Days 3, 8, 29, 57, 85, 134, 183, 232, 274 and 365
Time frame: 365 days
The assessment of Tmax for each of the monoclonal antibodies of ADM03820 as measured by mAb specific enzyme-linked immunosorbent assay (ELISA) (Phase 2)
Pre-dose and on Days 3, 8, 29, 57, 85, 134, 183, 232, 274 and 365
Time frame: 365 days
The assessment of AUC(0-t) for each of the monoclonal antibodies of ADM03820 as measured by mAb specific enzyme-linked immunosorbent assay (ELISA) (Phase 2)
Pre-dose and on Days 3, 8, 29, 57, 85, 134, 183, 232, 274 and 365
Time frame: 365 days
To assess SARS-CoV-2 antibody microneutralization levels (Phase 2)
Pre-dose and at Days 3, 29, and 57
Time frame: 57 days
To assess anti-drug antibody levels (Phase 2)
Pre-dose and on Days, 85, 134, 183, 232, 274, and 365
Time frame: 365 days
To assess daily COVID-19 symptoms (Phase 2)
COVID-19 daily symptoms reported by participants in diaries
Time frame: 183 days
SARS-CoV-2 RT-PCR assay in symptomatic subjects (Phase 2)
Time frame: 540 days
Severity of each symptom (Phase 3)
Severity of symptoms are assessed from Day 1 through end of study
Time frame: 540 days
Incidence of mild, virologically confirmed COVID-19 (Phase 3)
Number of participants with mild, virologically confirmed COVID-19 through Days 29, 57, 134 and 183
Time frame: 183 days
Incidence of moderate, severe, or critical virologically confirmed COVID 19 (Phase 3)
Number of participants with moderate, severe, or critical virologically confirmed COVID 19 through Days 29, 57, 134, and 183
Time frame: 183 days
Incidence of and severity of virologically-confirmed COVID-19 (Phase 3)
Number of participants with virologically-confirmed COVID-19 and severity of symptoms from Days 29, 57, 134, and 183 through Day 540
Time frame: 540 days
Incidence of AEs, SAEs, and medically attended events (Phase 3)
Number of participants with AEs, SAEs, and medically attended events through end of study
Time frame: 540 days