Study to Evaluate the Safety & Immunogenicity of IMNN-101 Administered in Healthy Adults Previously Vaccinated Against SARS-CoV-2

This is an open-label phase 1/2, dose-escalation study. Participants will receive a single intramuscular (IM) dose of IMNN-101 on Day 0 in the deltoid muscle and will be followed through 12 months post-vaccination (through Study Day 365). Phase 1: A total of twenty-four (24) participants will be enrolled into one of three groups listed below: Group 1 (8 participants) - 0.25 mL at 2 mg/ml of IMNN-101 DNA to be administered as 0.5 mg dose intramuscularly (IM) at Day 0 Group 2 (8 participants) - 0.50 mL at 2 mg/ml of IMNN-101 DNA to be administered as 1.0 mg dose intramuscularly (IM) at Day 0 Group 3 (8 participants) - 1.0 mL at 2 mg/ml of IMNN-101 DNA to be administered as 2.0 mg dose intramuscularly (IM) at Day 0 To assess early safety signals for this Phase 1 study, vaccination will proceed in a staged fashion. Sentinel participant dosing will begin with 4 participants in Group 1 (0.25 mL). If no halting rules have been met after Group 1 sentinels complete Day 7, then the remaining 4 participants in Group 1 may enroll and sentinel dosing will begin with 4 participants in Group 2 (0.5 mL). If no halting rules have been met after Group 2 sentinels complete Day 7, then the remaining 4 participants in Group 2 may enroll and sentinel dosing will begin with 4 participants in Group 3 (1.0 mL). If no halting rules have been met after Group 3 sentinels complete Day 7, then the remaining 4 participants in Group 3 may enroll. Phase 2: Once a review of the safety and immunogenicity is completed in Phase 1 then an expansion Phase 2 will commence utilizing the recommended Phase 2 dose (RP2D). Fifty (50) healthy participants meeting eligibility criteria will be enrolled.