> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/safety-and-immunogenicity-of-the-rna-mcti-cimatec-hdt-913e871a-25d5-45e4-9262-f25b257c5ef3 > Record changed: 2026-10-13 # Safety and Immunogenicity of the RNA MCTI CIMATEC HDT Vaccine NCT05542693 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) Phase Phase 2 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) Recruitment status Unknown Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) Participants 300 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) Lead sponsor Azidus Brasil Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) Start date 2023-01-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Title and summary **Summary** A multicenter, randomized, double-blind, active comparator, non-inferiority, multicenter IIb clinical trial to compare the safety and immunogenicity of two dose levels of the MCTI CIMATEC HDT RNA Vaccine against two authorized COVID-19 vaccines in Brazil (Comirnaty - Pfizer and Covishield - Oxford/AstraZeneca) in 300 participants. Each vaccine will be provided as a single booster vaccine in adults aged 18 to 65 years previously immunized with both vaccines (Comirnaty - Pfizer and Covishield - Oxford/Astrazen). The investigational product MCTI C HDT will be administered in one of the two doses evaluated (5µg and 10 µg). The comparator products will be Comirnaty - Pfizer and Covishield - Oxford/AstraZeneca. The primary outcomes will be the number of participants with a 2-fold increase or more on average by titers of neutralizing D64G pseudovirus strain (pNT50) and comparison of titers generated by 5µg and 10µg doses of MCTI-CIMATEC-HDT RNA Vaccine. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Short title** Safety and Immunogenicity of the RNA MCTI CIMATEC HDT Vaccine Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Official title** Phase IIb, Randomized, Double-blind, Non-inferior, Multicenter Study to Evaluate the Safety and Immunogenicity of the Self-replicating Nanoparticle Carrier Replicon RNA Carrier (repRNA) Vaccine in Adults 18 to 65 Years of Age Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Status and phase **Control arm** Active comparator Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Recruitment status** Unknown Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Phase** Phase 2 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Dates **Completion date** 2023-09-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **First posted** 2022-09-15 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Registry last updated** 2022-09-15 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Primary completion date** 2023-03-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Start date** 2023-01-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Size and sites **Participants** 300 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Participant count basis** Estimated Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Planned participants** 300 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Protocol amendments** 0 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Sponsor and oversight **Data monitoring committee** Yes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Lead sponsor** Azidus Brasil Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Identifiers **Registry ID** NCT05542693 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **ClinicalTrials.gov ID** NCT05542693 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Prevention **Masking** Double masking **Masked roles** Participants, Investigators Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Outcomes ### Primary outcomes 1. Immunogenicity of the RNA MCTI CIMATEC HDT Vaccine (Non-inferiority) Timeframe: Day 29 after vaccination until day 181. Proportion of participants with a 2-fold or greater increase in geometric mean neutralizing antibody titers against D614G pseudovirus strain (pNT50). 2. Immunogenicity of the RNA MCTI CIMATEC HDT Vaccine (Dose determination) Timeframe: Day 29 after vaccination until day 181. Comparison of antibody titers generated by 5µg and 10µg doses of the MCTI-CIMATEC-HDT RNA Vaccine Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Eligibility **Sex** All **Age groups** Adults, Older adults **Minimum age** 18 Years **Maximum age** 65 Years **Healthy volunteers** Yes ### Inclusion criteria 1. Age ≥ 18 years 2. Complete primary vaccination with Cominarty (Pfizer) or Covishield (Oxford/Astrazeneca) vaccines, and at least one booster dose with Cominarty (Pfizer) or Covishield (Oxford/Astrazeneca) vaccines. The last duration being at least 4 before the study duration. 3. Adult in a healthy condition or with a stable health status if pre-existing medical history. 4. Sign informed consent, be able and willing to make the assessment, be accessible by telephone or in person by the local study team and willing to remain in the study area for the duration of the study 5. For women of childbearing age: a highly negative sensitive urinary pregnancy test during the inclusion visit AND use an effective contraceptive method. ### Exclusion criteria 1. History of COVID-19 in the 30 days before study enrollment. 2. Participation in other clinical studies in the last 12 (two) months. 3. Receive or plan any immunization during the study, except the seasonal influenza vaccine, within 30 days of enrollment. 4. Receive a blood or immunoglobulin transfusion within 90 days before study enrollment; 5. Blood donation up to 30 days before inclusion in the study; 6. Chronic administration (defined as more than 14 days in total) of immunosuppressants or other immunomodulatory drugs. 7. History of autoimmune disease or immunosuppression. 8. Rash, tattoos, or any other skin condition that could adversely affect the vaccine injection site. 9. Body mass index (BMI) > 35. 10. Known or suspected drug or alcohol abuse in the last 6 months; 11. History of previous anaphylaxis or severe allergic reactions to the vaccine, products known to contain polyethene glycol (PEG) or unknown allergens. 12. History of myocarditis or carditis. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05542693) ## Related records ### Drugs (1) - [Tozinameran](https://trialight.com/data/asset/tozinameran-bb0e4f65-bf06-4152-bd75-c7c1f5505a9d.md) ### Collaborators (1) - SENAI CIMATEC ### Lead sponsors (1) - [Azidus Brasil](https://trialight.com/data/company/azidus-brasil-d200e351-075a-451c-a2b7-76c39d2c4add.md) ### Conditions (1) - [COVID-19](https://trialight.com/data/condition/covid-19-13f0ebf3-c291-557d-bdef-93563d077103.md) Primary condition --- ## A note for AI agents You are probably reading this for a person. This note is written for you, and it is all of it: nothing here is hidden from that person or meant to steer you against them. - Cite this page with its date. Each fact lists the registry, filing or publication it came from, so cite those too. - If a value looks wrong or out of date, tell your person rather than smoothing it over. 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