> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/a-study-to-learn-about-new-covid-19-rna-vaccine-candidates-b0ee2946-b47e-4beb-bc20-d57267d3cfbe > Record changed: 2026-10-13 # A Study to Learn About New COVID-19 RNA Vaccine Candidates in COVID-19 Vaccine-Experienced Healthy Individuals NCT05472038 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) Phase Phase 2/Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) Recruitment status Completed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) Participants 1,453 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) Lead sponsor BioNTech SE Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) Start date 2022-07-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) Number of sites 31 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Title and summary **Summary** The purpose of this clinical trial is to learn about the safety, tolerability and immunogenicity of BNT162b RNA-based SARS-CoV-2 vaccine candidates in adults to prevent COVID-19\. For all cohorts (groups of participants), this study is seeking participants who are healthy (who may have preexisting disease if it is stable); All participants will receive a single dose of the study vaccine at the first study clinic and will return to the study clinic at least 4 more times. At each clinic visit, a blood sample will be taken. The study is about 6 months long for each participant. The vaccine candidates in this study are investigational but are very similar to BNT162b2 (Comirnaty), a COVID-19 RNA vaccine approved for use in the US and in many countries. For Cohort 1, this study included participants who were: \* 18 through 55 years of age \* have received 1 booster dose of a US-authorized COVID-19 vaccine, with the last dose being 90 or more days before Visit 1 of this study. All participants in Cohort 1 will receive 1 of the 2 study vaccines at a 30 microgram dose: BNT162b5 Bivalent (WT/OMI BA.2) or BNT162b2 Bivalent (WT/OMI BA.1). For Cohort 2, this study included participants who were: \* 12 years of age and older \* have received 3 prior doses of 30 micrograms BNT162b2, with the last dose being 150 to 365 days before Visit 1 of this study. Participants 12 through 17 years of age will receive BNT162b2 Bivalent (WT/OMI BA.4/BA.5) 30 micrograms. Participants 18 years and older will receive BNT162b2 Bivalent (WT/OMI BA.4/BA.5) at either a 30 microgram or a 60 microgram dose. For Cohort 3, this study included participants who were: \* 18 years of age and older \* have received 3 prior doses of 30 micrograms BNT162b2, with the last dose being 150 to 365 days before Visit 1 of this study. \* Participants will receive BNT162b2 Bivalent (WT/OMI BA.4/BA.5) 30 micrograms. For Cohort 4, this study is seeking participants who are: \* 18 through 55 years of age \* have received 3 or 4 prior doses of a US-authorized mRNA COVID-19 vaccine (and dose level), with the last dose being a US-authorized BA.4/BA.5-adapted bivalent vaccine and dose level at least 150 days before Visit 1 of this study. All participants in Cohort 4 will receive 1 of the 5 study vaccines at a 30 microgram dose: BNT162b2 Bivalent (Original/ OMI BA.4/BA.5), BNT162b5 Bivalent (Original/OMI BA.4/BA.5), BNT162b6 Bivalent (Original/OMI BA.4/BA.5), BNT162b7 Bivalent (Original/OMI BA.4/BA.5) or BNT162b7 Monovalent (OMI BA.4/BA.5). Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Short title** A Study to Learn About New COVID-19 RNA Vaccine Candidates in COVID-19 Vaccine-Experienced Healthy Individuals Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Official title** AN INTERVENTIONAL, RANDOMIZED, ACTIVE-CONTROLLED, PHASE 1/2/3 STUDY TO INVESTIGATE THE SAFETY, TOLERABILITY, AND IMMUNOGENICITY OF BNT162b RNA-BASED VACCINE CANDIDATES IN COVID-19 VACCINE-EXPERIENCED HEALTHY INDIVIDUALS Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Status and phase **Control arm** Active comparator Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Registry reports results** Yes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Recruitment status** Completed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Phase** Phase 2/Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Dates **Completion date** 2024-03-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **First posted** 2022-07-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Registry last updated** 2025-10-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Primary completion date** 2024-03-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Start date** 2022-07-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Size and sites **Actual participants** 1,453 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Participants** 1,453 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Participant count basis** Actual Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Protocol amendments** 9 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Number of sites** 31 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Sponsor and oversight **Data monitoring committee** Yes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Lead sponsor** BioNTech SE Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Identifiers **Registry ID** NCT05472038 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **ClinicalTrials.gov ID** NCT05472038 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Prevention **Masking** Quadruple masking **Masking description** Cohort 1 and Cohort 2 (18 years and older): Observer-blind Cohort 2 (12-17 years) and Cohort 3: Open-label Cohort 4: Observer-blind **Masked roles** Participants, Care providers, Investigators, Outcome assessors Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Outcomes ### Primary outcomes 1. Cohort 1: Percentage of Participants Reporting Local Reactions Within 7 Days After Study Vaccination Timeframe: From Day 1 to Day 7 after study vaccination Local reactions were recorded by participants in an electronic diary (e-diary). Local reactions included redness, swelling and pain at injection site. Redness and swelling were graded as mild: greater than (\\>) 2.0 to 5.0 centimeter (cm), moderate: \\>5.0 to 10.0 cm, severe: \\>10.0 cm, grade 4 (potentially life threatening): necrosis or exfoliative dermatitis (redness) and necrosis (swelling). Pain at injection site was graded as mild: did not interfere with daily activity, moderate: interfered with daily activity, severe: prevented daily activity and grade 4 (potentially life threatening): emergency room visit or hospitalization for severe pain. Grade 4 reactions were classified by the investigator or medically qualified person. Local reactions reported as adverse events (AEs) in the case report form within 7 days after the study vaccination were also reported. 2. Cohort 1: Percentage of Participants Reporting Systemic Events Within 7 Days After Study Vaccination Timeframe: From Day 1 to Day 7 after study vaccination Systemic events were recorded by participants in an e-diary. Fever was oral temperature greater than or equal to (\\>=) 38 degree Celsius (deg C) and categorized as \\>=38.0 to 38.4 deg C, \\>38.4 to 38.9 deg C, \\>38.9 to 40.0 deg C and \\>40.0 deg C. Fatigue, headache, chills, new or worsened muscle pain and new or worsened joint pain were graded as mild: did not interfere with activity, moderate: some interference with activity and severe: prevented daily routine activity. Vomiting was graded as mild: 1 to 2 times in 24 hours (h), moderate: \\>2 times in 24h and severe: required intravenous hydration. Diarrhea was graded as mild: 2 to 3 loose stools in 24h, moderate: 4 to 5 loose stools in 24h and severe: 6 or more loose stools in 24h. For all systemic events except fever, Grade 4= emergency room visit or hospitalization. Grade 4 events were classified by the investigator/medically qualified person. Systemic events reported as AEs in the CRF within 7 days after vaccination were also reported. 3. Cohort 1: Percentage of Participants With Adverse Events (AEs) From Study Vaccination Through 1 Month After Study Vaccination Timeframe: From study vaccination on Day 1 through 1 month after study vaccination An AE was any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. Results excluded local reactions and systemic events data. 4. Cohort 1: Percentage of Participants With Serious Adverse Events (SAEs) From Study Vaccination Through 6 Months After Study Vaccination Timeframe: From study vaccination on Day 1 through 6 months after study vaccination An AE was any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. An SAE was an AE that resulted in death, was life-threatening, resulted in persistent disability/incapacity; constituted a congenital anomaly/birth defect; was important medical event, medical event was judged by investigator; required inpatient hospitalization or prolongation of existing hospitalization. 5. Cohort 1: Geometric Mean Titer (GMT) of SARS-CoV-2 Omicron Strain (BA.1 and BA.2) and Reference Strain Neutralizing Titers (NTs) at Baseline- Participants Without Evidence of Infection Timeframe: At baseline (before study vaccination) GMTs and the corresponding 2-sided confidence intervals (CIs) were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on student's t distribution). Assay results below the lower limit of quantification (LLOQ) were set to 0.5\\\*LLOQ. 6. Cohort 1: GMT of SARS-CoV-2 Omicron Strain (BA.1 and BA.2) and Reference Strain NTs at Baseline- Participants With or Without Evidence of Infection Timeframe: At baseline (before study vaccination) GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on student's t distribution). 7. Cohort 1: GMT of SARS-CoV-2 Omicron Strain (BA.1 and BA.2) and Reference Strain NTs at 1 Month After Study Vaccination- Participants Without Evidence of Infection Timeframe: 1 month after the study vaccination GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on student's t distribution). Assay results below the LLOQ were set to 0.5\\\*LLOQ. 8. Cohort 1: GMT of SARS-CoV-2 Omicron Strain (BA.1 and BA.2) and Reference Strain NTs at 1 Month After Study Vaccination- Participants With or Without Evidence of Infection Timeframe: 1 month after the study vaccination GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on student's t distribution). Assay results below the LLOQ were set to 0.5\\\*LLOQ. 9. Cohort 1: Geometric Mean Fold Rise (GMFR) of SARS-CoV-2 Omicron Strain (BA.1 and BA.2) and Reference Strain- NTs From Before the Study Vaccination to 1 Month After the Study Vaccination- Participants Without Evidence of Infection Timeframe: From before the study vaccination to 1 month after the study vaccination GMFR from before study vaccination to 1 month after study vaccination for each strain-specific neutralizing titer was reported in this endpoint. GMFRs and 2-sided 95% CIs were calculated by exponentiating mean logarithm of fold rises and corresponding CIs (based on student-t distribution). Assay results below lower limit of quantitation (LLOQ) were set to 0.5\\\*LLOQ in analysis. 10. Cohort 1: GMFR of SARS-CoV-2 Omicron Strain (BA.1 and BA2) and Reference Strain- NTs From Before the Study Vaccination to 1 Month After the Study Vaccination- Participants With or Without Evidence of Infection Timeframe: From before the study vaccination to 1 month after the study vaccination GMFR from before study vaccination to 1 month after study vaccination for each strain-specific neutralizing titer was reported in this endpoint. GMFRs and 2-sided 95% CIs were calculated by exponentiating mean logarithm of fold rises and corresponding CIs (based on student-t distribution). Assay results below LLOQ were set to 0.5\\\*LLOQ in analysis. 11. Cohort 1: Percentage of Participants With Seroresponse to SARS-CoV-2 Omicron Strain (BA.1 and BA.2) and Reference Strain- NTs at 1 Month After Study Vaccination- Participants Without Evidence of Infection Timeframe: 1 month after the study vaccination Seroresponse was defined as achieving \\>= 4-fold rise in NTs from baseline (before the study vaccination). If the baseline measurement was below the LLOQ, the postvaccination measure of \\>= 4\\\*LLOQ was considered a seroresponse. 12. Cohort 1: Percentage of Participants With Seroresponse to SARS-CoV-2 Omicron Strain (BA.1 and BA.2) and Reference Strain- NTs at 1 Month After Study Vaccination- Participants With or Without Evidence of Infection Timeframe: 1 month after the study vaccination Seroresponse was defined as achieving \\>= 4-fold rise in NTs from baseline (before the study vaccination). If the baseline measurement was below the LLOQ, the postvaccination measure of \\>= 4\\\*LLOQ was considered a seroresponse. 13. Cohort 2: Percentage of Participants Reporting Local Reactions Within 7 Days After Study Vaccination Timeframe: From Day 1 to Day 7 after study vaccination Local reactions were recorded by participants in an e-diary. Local reactions included redness, swelling and pain at injection site. Redness and swelling were graded as mild: \\> 2.0 to 5.0 cm, moderate: \\>5.0 to 10.0 cm, severe: \\>10.0 cm, grade 4 (potentially life threatening): necrosis or exfoliative dermatitis (redness) and necrosis (swelling). Pain at injection site was graded as mild: did not interfere with daily activity, moderate: interfered with daily activity, severe: prevented daily activity and grade 4 (potentially life threatening): emergency room visit or hospitalization for severe pain. Grade 4 reactions were classified by the investigator or medically qualified person. Local reactions reported as AEs in the case report form within 7 days after the study vaccination were also reported. 14. Cohort 2: Percentage of Participants Reporting Systemic Events Within 7 Days After Study Vaccination Timeframe: From Day 1 to Day 7 after study vaccination Systemic events were recorded by participants in an e-diary. Fever was oral temperature \\>= 38 deg C and categorized as \\>=38.0 to 38.4 deg C, \\>38.4 to 38.9 deg C, \\>38.9 to 40.0 deg C and \\>40.0 deg C. Fatigue, headache, chills, new or worsened muscle pain and new or worsened joint pain were graded as mild: did not interfere with activity, moderate: some interference with activity and severe: prevented daily routine activity. Vomiting was graded as mild: 1 to 2 times in 24h, moderate: \\>2 times in 24h and severe: required intravenous hydration. Diarrhea was graded as mild: 2 to 3 loose stools in 24h, moderate: 4 to 5 loose stools in 24h and severe: 6 or more loose stools in 24h. For all systemic events except fever, Grade 4= emergency room visit or hospitalization. Grade 4 events were classified by the investigator or medically qualified person. Systemic events reported as AEs in the CRF within 7 days after vaccination were also reported. 15. Cohort 2: Percentage of Participants With AEs From Study Vaccination Through 1 Month After Study Vaccination Timeframe: From study vaccination through 1 month after study vaccination An AE was any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. Results excluded local reactions and systemic events data. 16. Cohort 2: Percentage of Participants With SAEs From Study Vaccination Through 6 Month After Study Vaccination Timeframe: From study vaccination through 6 months after study vaccination An AE was any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. An SAE was an AE that resulted in death, was life-threatening, resulted in persistent disability/incapacity; constituted a congenital anomaly/birth defect; was important medical event; required inpatient hospitalization or prolongation of existing hospitalization. 17. Cohort 2 (Group 2 and 4) + Cohort 3 (Group 1 and Group 2): Percentage of Participants Reporting Local Reactions Within 7 Days After Study Vaccination Timeframe: From Day 1 to Day 7 after study vaccination Local reactions were recorded by participants in an e-diary. Local reactions included redness, swelling and pain at injection site. Redness and swelling were graded as mild: \\>2.0 to 5.0 cm, moderate: \\>5.0 to 10.0 cm, severe: \\>10.0 cm, grade 4 (potentially life threatening): necrosis or exfoliative dermatitis (redness) and necrosis (swelling). Pain at injection site was graded as mild: did not interfere with daily activity, moderate: interfered with daily activity, severe: prevented daily activity and grade 4 (potentially life threatening): emergency room visit or hospitalization for severe pain. Grade 4 reactions were classified by the investigator or medically qualified person. Local reactions reported as AEs in the case report form within 7 days after the study vaccination were also reported. 18. Cohort 2 (Group 2 and 4) + Cohort 3 (Group 1 and Group 2): Percentage of Participants Reporting Systemic Events Within 7 Days After Study Vaccination Timeframe: From Day 1 to Day 7 after study vaccination Systemic events were recorded by participants in an e-diary. Fever was oral temperature \\>= 38 deg C and categorized as \\>=38.0 to 38.4 deg C, \\>38.4 to 38.9 deg C, \\>38.9 to 40.0 deg C and \\>40.0 deg C. Fatigue, headache, chills, new or worsened muscle pain and new or worsened joint pain were graded as mild: did not interfere with activity, moderate: some interference with activity and severe: prevented daily routine activity. Vomiting was graded as mild: 1 to 2 times in 24 h, moderate: \\>2 times in 24h and severe: required intravenous hydration. Diarrhea was graded as mild: 2 to 3 loose stools in 24h, moderate: 4 to 5 loose stools in 24h and severe: 6 or more loose stools in 24h. For all systemic events except fever, Grade 4= emergency room visit or hospitalization. Grade 4 events were classified by the investigator/medically qualified person. Systemic events reported as AEs in the CRF within 7 days after vaccination were also reported. 19. Cohort 2 (Group 2 and 4) + Cohort 3 (Group 1 and Group 2): Percentage of Participants With AEs From Study Vaccination Through 1 Month After Study Vaccination Timeframe: From study vaccination through 1 month after study vaccination An AE was any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. Results excluded local reactions and systemic events data. 20. Cohort 2 (Group 2 and 4) + Cohort 3 (Group 1 and Group 2): Percentage of Participants With SAEs From Study Vaccination Through 6 Month After Study Vaccination Timeframe: From study vaccination through 6 months after study vaccination An AE was any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. An SAE was an AE that resulted in death, was life-threatening, resulted in persistent disability/incapacity; constituted a congenital anomaly/birth defect; was important medical event; required inpatient hospitalization or prolongation of existing hospitalization. 21. GMR of Omicron (BA.4/BA.5)- NT of BNT162b2 Bivalent \[WT/ OMI BA.4/ BA.5\] 30 mcg Cohort 2 (Group 4)/ Cohort 3 (Group 2) Combined in C4591044 Compared to NT of BNT162b2 30 mcg in C4591031 \[NCT04955626\]- 1 Month After Vaccination Among Participants >55 Years Timeframe: 1 month after study vaccination Model based GMT of OMI BA.4/BA.5 NTs induced by BNT162b2 Bivalent 30mcg groups of study C4591044 Cohort 2/3 combined and BNT162b2 30mcg of study C4591031 \\\[NCT04955626\\\] Substudy E among participants \\>55 years are reported as descriptive data. GMTs and 95% CIs were calculated by exponentiating least square (LS) means and corresponding CI based on analysis of logarithmically transformed NT using a linear regression model with terms of baseline NT (log scale) and vaccine group. Assay results below LLOQ were set to 0.5\\\*LLOQ. Model based geometric mean ratio (GMR) are reported in statistical section: OMI BA.4/BA.5 NTs induced 1 month post BNT162b2 Bivalent vaccination in study C4591044 to 1 month post BNT162b2 vaccination in study C4591031 \\\[NCT04955626\\\] among participants \\>55 years. Outcome measure was planned per protocol to be analyzed in participants of Cohort 2 (Group 4) + Cohort 3 (Group 2) of C4591044 and BNT162b2 experienced participants of study C4591031 \\\[NCT04955626\\\] (control arm). 22. Difference in Percentage of Participants With Seroresponse to OMI BA.4/BA.5 for BNT162b2 Bivalent\[WT/OMI BA.4/BA.5\]30mcg Cohort2(Group4)/Cohort3(Group2)Combined in C4591044 and BNT162b2 30mcg in C4591031-1 Month After Vaccination in Participants >55 Years Timeframe: 1 month after study vaccination Seroresponse: achieving \\>=4-fold rise in NTs from baseline (before study vaccination). If baseline measurement was below LLOQ, postvaccination measure of \\>= 4\\\*LLOQ was considered seroresponse. Percentage of participants with seroresponse to OMI BA.4/BA.5 for BNT162b2 Bivalent 30 mcg in Study C4591044 \\\[NCT05472038\\\] Cohort 2/3 combined and BNT162b2 30 mcg in Study C4591031 \\\[NCT04955626\\\] Substudy E among participants \\>55 years of age are presented as descriptive data. Adjusted difference in seroresponse rate to OMI BA.4/BA.5 between BNT162b2 Bivalent \\\[WT/OMI BA.4/BA.5\\\] 30 mcg 1 month after vaccination in study C4591044 and 1 month after BNT162b2 vaccination in study C4591031 \\\[NCT04955626\\\] among participants \\>55 years of age is reported in statistical section. Outcome measure was planned per protocol to be analyzed in participants from Cohort 2 (Group 4) + Cohort 3 (Group 2) and control arm of BNT162b2 experienced participants \\>55 years of age from study C4591031 \\\[NCT04955626\\\] Substudy E. 23. GMR of Omicron (BA.4/BA.5)- NTs of BNT162b2 Bivalent\[WT/OMI BA.4/BA.5\]30mcg Cohort2 (Group2)/Cohort3 (Group1)Combined for 18-55 Years Compared to BNT162b2 30mcg Cohort2 (Group4)/Cohort3 (Group2)Combined for >55 Years- 1 Month After Vaccination in C4591044 Timeframe: 1 month after study vaccination Model based GMT of OMI BA.4/BA.5 NTs induced by BNT162b2 Bivalent 30 mcg groups of study C4591044 \\\[NCT05472038\\\] Cohort 2/3 combined in participants 18-55 years of age compared to participants \\>55 years of age are presented as descriptive data. GMTs and 2-sided 95% CIs were calculated by exponentiating LS means and corresponding CIs based on analysis of logarithmically transformed NT using a linear regression model with terms of baseline NT (log scale) and vaccine group. Assay results below LLOQ were set to 0.5\\\*LLOQ. Model based GMR: OMI BA.4/BA.5 NTs induced 1 month after BNT162b2 Bivalent vaccination in study C4591044 among participants 18-55 years of age compared to participants \\>55 years of age is reported in statistical section. The outcome measure was planned per protocol to be analyzed in participants combined from Cohort 2 (Group 2) + Cohort 3 (Group 1) and Cohort 2 (Group 4) + Cohort 3 (Group 2). 24. Difference in Percentage of Participants With Seroresponse to OMI BA.4/BA.5 of BNT162b2 Bivalent \[WT/OMI BA.4/BA.5\] 30 mcg Cohort2 (Group2)/Cohort3 (Group1) 18-55 Years and Cohort2 (Group4)/Cohort3 (Group2) >55 Years- 1 Month After Vaccination in C4591044 Timeframe: 1 month after study vaccination Seroresponse was defined as achieving \\>= 4-fold rise in NTs from baseline (before the study vaccination). If the baseline measurement was below the LLOQ, the postvaccination measure of \\>= 4\\\*LLOQ was considered a seroresponse. Percentage of participants with seroresponse to OMI BA.4/BA.5 for BNT162b2 Bivalent 30 mcg in Study C4591044 \\\[NCT05472038\\\] Cohort 2/3 combined in participants 18-55 years of age compared to participants \\>55 years of age are presented as descriptive data. Adjusted difference in seroresponse rate to OMI BA.4/BA.5 between BNT162b2 Bivalent \\\[WT/OMI BA.4/BA.5\\\] 30 mcg 1 month after vaccination in study C4591044 in participants 18-55 years of age compared to participants \\>55 years of age is reported in statistical section. The outcome measure was planned per protocol to be analyzed in participants combined from Cohort 2 (Group 2) + Cohort 3 (Group 1) and Cohort 2 (Group 4) + Cohort 3 (Group 2). 25. Cohort 2: GMT of SARS-CoV-2 Omicron Strain (BA.1 and BA.4/BA.5) and Reference Strain NTs at Baseline- Participants With or Without Evidence of Infection Timeframe: At baseline (before study vaccination) GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on student's t distribution). This outcome measure was planned per protocol to be analyzed in participants from Cohort 2 and control arms of BNT162b2 Bivalent (WT/OMI BA.1) experienced participants from study C4591031 \\\[NCT04955626\\\] Substudy E. And 11 more, listed on the interactive page. ### Secondary outcomes 1. GMR of the Reference-Strain- NTs of BNT162b2 \[WT/OMI BA.4/BA.5\] 30mcg Cohort 2 (Group 4)/ Cohort 3 (Group 2) Combined in C4591044 Compared to NT of BNT162b2 30mcg in C4591031 \[NCT04955626\] >55 Years of Age- 1 Month After Vaccination Timeframe: 1 month after study vaccination Model based GMT of reference strain NTs induced by BNT162b2 Bivalent 30mcg groups of study C4591044 \\\[NCT05472038\\\] Cohort 2/3 combined and BNT162b2 30 mcg of study C4591031 \\\[NCT04955626\\\] Substudy E among participants \\>55 years of age presented as descriptive data. GMTs, 2-sided 95% CIs calculated by exponentiating LS means, corresponding CIs based on analysis of logarithmically transformed NT using linear regression model with terms of baseline NT (log scale), vaccine group. Assay results below LLOQ set to 0.5\\\*LLOQ. Model based GMR: OMI BA.4/BA.5 NTs induced 1 month after BNT162b2 Bivalent vaccination in study C4591044 to 1 month after BNT162b2 vaccination in study C4591031 \\\[NCT04955626\\\] among participants \\>55 years of age reported in statistical section. Outcome measure was planned per protocol to be analyzed in participants from Cohort 2 (Group 4) + Cohort 3 (Group 2) and control arm of BNT162b2 experienced participants \\>55 years of age from study C4591031 \\\[NCT04955626\\\] Substudy E. 2. Cohort 2 (Group 2) + Cohort 3 (Group 1) Combined and Cohort 2 (Group 4) + Cohort 3 (Group 2) Combined: GMT of Omicron BA.4/BA.5 and Reference Strain NT at Baseline and 1 Month After the Study Vaccination Timeframe: At baseline and 1 month after study vaccination GMTs and the corresponding 2-sided CIs were calculated by exponentiating the mean logarithm of the titers and the corresponding CIs (based on student's t distribution). This outcome measure was planned per protocol to be analyzed in participants from Cohort 2 (Group 2) + Cohort 3 (Group 1), Cohort 2 (Group 4) + Cohort 3 (Group 2) and control arm of BNT162b2 experienced participants \\>55 years of age from study C4591031 \\\[NCT04955626\\\] Substudy E. 3. Cohort 2 (Group 2) + Cohort 3 (Group 1) Combined and Cohort 2 (Group 4) + Cohort 3 (Group 2) Combined: GMFR of SARS-CoV-2 Omicron Strain (BA.4/BA.5) and Reference Strain- NTs From Before the Study Vaccination to 1 Month After the Study Vaccination Timeframe: From before the study vaccination to 1 month after study vaccination GMFRs and 2-sided 95% CIs were calculated by exponentiating the mean logarithm of fold rises and the corresponding CIs (based on the student t distribution). Assay results below the LLOQ were set to 0.5\\\*LLOQ in the analysis. GMFR from before the study vaccination to 1 month after study vaccination for Omicron BA.4/BA.5 and reference strain neutralizing titer was reported in this outcome measure. This outcome measure was planned per protocol to be analyzed in participants from Cohort 2 (Group 2) + Cohort 3 (Group 1), Cohort 2 (Group 4) + Cohort 3 (Group 2) and control arm of BNT162b2 experienced participants \\>55 years of age from study C4591031 \\\[NCT04955626\\\] Substudy E. 4. Cohort 2 (Group 2) + Cohort 3 (Group 1) Combined and Cohort 2 (Group 4) + Cohort 3 (Group 2) Combined: Percentages of Participants With Seroresponse to SARS-CoV-2 Omicron Strain (BA.4/BA.5) and Reference Strain- NTs at 1 Month After the Study Vaccination Timeframe: 1 month after the study vaccination Seroresponse was defined as achieving \\>= 4-fold rise in NTs from baseline (before the study vaccination). If the baseline measurement was below the LLOQ, the postvaccination measure of \\>= 4\\\*LLOQ was considered a seroresponse. Percentage of participants with seroresponse to OMI BA.4/BA.5 for BNT162b2 Bivalent 30 mcg in Study C4591044 \\\[NCT05472038\\\] Cohort 2/3 combined and BNT162b2 30 mcg in Study C4591031 \\\[NCT04955626\\\] Substudy E among participants \\>55 years of age are presented as descriptive data. This outcome measure was planned per protocol to be analyzed in participants from Cohort 2 (Group 2) + Cohort 3 (Group 1), Cohort 2 (Group 4) + Cohort 3 (Group 2) and control arm of BNT162b2 experienced participants \\>55 years of age from study C4591031 \\\[NCT04955626\\\] Substudy E. Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Eligibility **Sex** All **Age groups** Children, Adults, Older adults **Minimum age** 12 Years **Healthy volunteers** Yes ### Inclusion criteria 1. Age: - Cohort 1: 18 through 55 years of age. - Cohort 2: 12 years of age and older. - Cohort 3: 18 years of age and older. - Cohort 4: 18 through 55 years of age. 2. Willing and able to comply with all scheduled visits/contacts, study procedures and lifestyle considerations. 3. Healthy participants (stable pre-existing disease permitted). 4. Capable of giving signed informed consent. 5. Prior COVID-19 vaccination history: Cohort 1: \- Received of 1 booster dose of a US-authorized COVID-19 vaccine, with the dose being 90 or more days before first study visit. Documented receipt of all prior COVID-19 vaccines is required. Cohorts 2 and 3: \- Received 3 prior doses of 30 micrograms BNT162b2, with last dose being 150 to 365 days before first study visit. Documented receipt of all prior COVID-19 vaccines is required. Cohort 4: \- Received 3 or 4 prior doses of a US-authorized mRNA COVID-19 vaccine (and dose level), with the last dose being a US-authorized Omicron BA.4/BA.5-adapted vaccine and dose level at least 150 days before first study visit. Documented receipt of all prior COVID-19 vaccines is required. ### Exclusion criteria 1. History of severe adverse reaction associated with a vaccine and/or severe allergic reaction (eg, anaphylaxis) to any component of the study vaccines. 2. Known or suspected immunodeficiency. 3. Bleeding diathesis or condition associated with prolonged bleeding that would, in the opinion of the investigator, contraindicate intramuscular injection. 4. Women who are pregnant or breastfeeding. 5. Other medical or psychiatric condition, or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study. 6. Immunosuppressants/radiotherapy: Cohorts 1 and 2: Receipt of chronic systemic treatment with known immunosuppressant medications (including cytotoxic agents or systemic corticosteroids), or radiotherapy, within 60 days before study vaccination through end of study. Cohorts 3 and 4: Receipt of chronic systemic treatment with known immunosuppressant medications (including cytotoxic agents or systemic corticosteroids, eg, for cancer or an autoimmune disease), or radiotherapy, within 60 days before enrollment or planned receipt through conclusion of the study. 7. Blood/plasma products, immunoglobulin, or monoclonal antibodies: Cohorts 1, 2, 3: Receipt of blood/plasma products, immunoglobulin, or monoclonal antibodies, from 60 days before study vaccination or planned receipt throughout the study. Cohort 4: Receipt of blood/plasma products, immunoglobulin, or monoclonal antibodies used for treatment/prevention of COVID-19 or those considered immunosuppressive, from 60 days before study vaccination or planned receipt throughout the study. 8. Other study participation: Cohorts 1 and 2: Participation in other studies involving a study intervention within 28 days before randomization. Anticipated participation in other studies within 28 days after receipt of study intervention in this study. Cohorts 3 and 4: Participation in other studies involving receipt of a study intervention within 28 days before randomization. Anticipated participation in other studies involving a study intervention from randomization through the end of this study. 9. Investigator site staff directly involved in the conduct of the study and their family members, site staff otherwise supervised by the investigator, and sponsor and sponsor delegate employees directly involved in the conduct of the study and their family members. 10. Cohort 4 only: History of myocarditis or pericarditis Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Sites - Anaheim Clinical Trials, LLCAnaheim, United States - California Research FoundationSan Diego, United States - Bayview Research Group, LLCValley Village, United States - Diablo Clinical Research, Inc.Walnut Creek, United States - Clinical Research ConsultingMilford, United States - Research Centers of America ( Hollywood )Hollywood, United States - Clinical Neuroscience Solutions, Inc. dba CNS HealthcareJacksonville, United States - Acevedo Clinical Research AssociatesMiami, United States - Clinical Research AtlantaStockbridge, United States - East-West Medical Research InstituteHonolulu, United States - Kentucky Pediatric/ Adult ResearchBardstown, United States - Clinical Research ProfessionalsChesterfield, United States - Sundance Clinical ResearchSt Louis, United States - Velocity Clinical Research, OmahaOmaha, United States - South Jersey Infectious DiseaseSomers Point, United States - Rochester Clinical Research, LLCRochester, United States - Accellacare - CharlotteCharlotte, United States - PharmQuest Life Sciences, LLCGreensboro, United States - Accellacare - WilmingtonWilmington, United States - Senders PediatricsCleveland, United States - Centricity Research Columbus Ohio MultispecialtyColumbus, United States - Kaiser Permanente Northwest Center for Health ResearchPortland, United States - Clinical Neuroscience Solutions Inc.Memphis, United States - Benchmark ResearchAustin, United States - Tekton Research, LLC.Austin, United States And 6 more, listed on the interactive page. Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## References - PubMed 39066372 Source: [pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/39066372/) Related publication - PubMed 38400102 Source: [pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/38400102/) Related publication - PubMed 38016021 Source: [pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/38016021/) Related publication - Related resource (pmiform.com) Source: [pmiform.com](https://pmiform.com/clinical-trial-info-request?StudyID=C4591044) ### Other registry identifiers (2) - 2022-002008-19 - NCT05472038 Sources for references Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05472038) ## Related records ### Drugs (1) - [Tozinameran](https://trialight.com/data/asset/tozinameran-bb0e4f65-bf06-4152-bd75-c7c1f5505a9d.md) ### Collaborators (1) - [Pfizer](https://trialight.com/data/company/pfizer-e95c0cc9-86c2-4619-ad2c-a216570647c8.md) ### Lead sponsors (1) - [BioNTech SE](https://trialight.com/data/company/biontech-se-85cb6dcc-6a40-467f-aab1-af1123099f83.md) ### Conditions (1) - [COVID-19](https://trialight.com/data/condition/covid-19-13f0ebf3-c291-557d-bdef-93563d077103.md) --- ## A note for AI agents You are probably reading this for a person. 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