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Bivalent BNT162b2 3 microgram dose

Phase 3

SARS-CoV-2 Virus | Monoclonal antibody | Infectious Disease |BioNTech SE|Trials Updated: Aug 6, 2026

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment4,338

FDA Designations

No designations recorded

Bivalent BNT162b2 3 microgram dose clinical trials

Bivalent BNT162b2 3 microgram dose · 1 trial · 3 indications

Phase 3 1
NCT05543616A Study to Learn About Variant-Adapted COVID-19 RNA Vaccine Candidate(s) in Healthy ChildrenSARS-CoV-2 Virus
COMPLETED4,338 Analytics
PHASE3COMPLETED
A Study to Learn About Variant-Adapted COVID-19 RNA Vaccine Candidate(s) in Healthy Children
SARS-CoV-2 VirusUnlock trial analytics

Study Endpoints

Primary Endpoints

Substudy A (SSA) - Ph 1 dose finding, percentage of participants reporting local reactions
for up to 7 days following Dose 1, Dose 2, Dose 3 and Dose 4

Participants ≥6 months to \<2 years of age: tenderness at the injection site, redness, and swelling as self-reported on electronic diaries Participants ≥2 to \<5 years of age: pain at the injection site, redness, and swelling as self-reported on electronic diaries

SSA - Ph 1 dose finding, percentage of participants reporting systemic events
for up to 7 days following Dose 1, Dose 2, Dose 3 and Dose 4

Participants ≥6 months to \<2 years of age: fever, decreased appetite, drowsiness, and irritability as self-reported on electronic diaries Participants ≥2 to \<5 years of age: fever, fatigue, headache, chills, vomiting, diarrhea, new or worsened muscle pain, and new or worsened joint pain as self-reported on electronic diaries

SSA - Ph 1 dose finding, percentage of participants reporting adverse events
from Dose 1 to 1 month after Dose 3 and from Dose 4 to 1 month after Dose 4

as elicited by investigational site staff

SSA - Ph 1 dose finding, percentage of participants reporting serious adverse events
from Dose 1 to 6 months after the last dose

as elicited by investigational site staff

SSA - Ph 2/3, percentage of participants reporting local reactions
for up to 7 days following Dose 1 (for Groups 1 through 6), Dose 2 (for Groups 1, 2, 3, and 6), and Dose 3 (for Group 3)

Participants ≥6 months to \<2 years of age: tenderness at the injection site, redness, and swelling as self-reported on electronic diaries Participants ≥2 to \<5 years of age: pain at the injection site, redness, and swelling as self-reported on electronic diaries

SSA - Ph 2/3, percentage of participants reporting systemic events
for up to 7 days following Dose 1 (for Groups 1 through 6), Dose 2 (for Groups 1, 2, 3, and 6), and Dose 3 (for Group 3)

Participants ≥6 months to \<2 years of age: fever, decreased appetite, drowsiness, and irritability as self-reported on electronic diaries Participants ≥2 to \<5 years of age: fever, fatigue, headache, chills, vomiting, diarrhea, new or worsened muscle pain, and new or worsened joint pain as self-reported on electronic diaries

SSA - Ph 2/3, percentage of participants reporting adverse events
from Dose 1 to 1 month after the last dose

as elicited by investigational site staff

SSA - Ph 2/3, percentage of participants reporting serious adverse events
from Dose 1 to 6 months after the last dose

as elicited by investigational site staff

SSA - Ph 2/3, noninferiority with respect to ratio of the geometric mean of SARS-CoV-2 Omicron XBB.1.5-neutralizing titers in participants ≥6 months to <2 years of age
At 1 month after 2 doses of BNT162b2 (Omicron XBB.1.5) 10 microgram (on a 0- and 8-week schedule) to 1 month after 3 doses (on a 0-, 3-, and 11-week schedule) of BNT162b2 (Omicron XBB.1.5) 3 microgram

As measured at the central laboratory

SSA - Ph 2/3, noninferiority with respect to seroresponse rate to the Omicron XBB.1.5 strain titers in participants ≥6 months to <2 years of age
At 1 month after 2 doses of BNT162b2 (Omicron XBB.1.5) 10 microgram (on a 0- and 8-week schedule) and at 1 month after 3 doses (on a 0-, 3-, and 11-week schedule) of BNT162b2 (Omicron XBB.1.5) 3 microgram

As measured at the central laboratory

SSA - Ph 2/3, noninferiority with respect to ratio of the geometric mean of SARS-CoV-2 Omicron XBB.1.5-neutralizing titers in participants ≥2 to <5 years of age
At 1 month after 1 dose of BNT162b2 (Omicron XBB.1.5) 10 microgram in participants ≥2 to <5 years of age to 1 month after 3 doses (on a 0/3/11-week schedule) of BNT162b2 (Omicron XBB.1.5) 3 microgram in participants ≥6 months to <2 years of age

As measured at the central laboratory

SSA - Ph 2/3, noninferiority with respect to seroresponse rate to the Omicron XBB.1.5 strain in participants ≥2 to <5 years of age
At 1 month after 1 dose of BNT162b2 (Omicron XBB.1.5) 10 microgram in participants ≥2 to <5 years of age and at 1 month after 3 doses (0/3/11-week schedule) of BNT162b2 (Omicron XBB.1.5) 3 microgram in participants ≥6 months to <2 years of age

As measured at the central laboratory

Substudy B (SSB) - percentage of participants reporting local reactions
for up to 7 days following Dose 1 (for Groups 1, 2 and 3) and Dose 2 (for Group 1)

Participants ≥6 months to \<2 years of age: tenderness at the injection site, redness, and swelling as self-reported on electronic diaries Participants ≥2 to \<5 years of age: pain at the injection site, redness, and swelling as self-reported on electronic diaries

SSB - percentage of participants reporting systemic events
for up to 7 days following Dose 1 (for Groups 1, 2 and 3) and Dose 2 (for Group 1)

Participants ≥6 months to \<2 years of age: fever, decreased appetite, drowsiness, and irritability as self-reported on electronic diaries Participants ≥2 to \<5 years of age: fever, fatigue, headache, chills, vomiting, diarrhea, new or worsened muscle pain, and new or worsened joint pain as self-reported on electronic diaries

SSB - percentage of participants reporting adverse events
from the first study vaccination to 1 month after the first study vaccination (for Groups 1, 2, and 3), and from the second study vaccination to 1 month after the second study vaccination (for Group 1 only)

as elicited by investigational site staff

SSB - percentage of participants reporting serious adverse events
from Dose 1 to 6 months after the last dose

as elicited by investigational site staff

SSB - superiority with respect to ratio of the geometric mean of SARS-CoV-2 Omicron BA.4/BA.5-neutralizing titers in participants ≥6 months to <5 years of age
at 1 month after Dose 4 for Group 2 participants who received 3 prior doses of BNT162b2 3 µg and a fourth dose of bivalent BNT162b2 to 1 month after Dose 3 in Study C4591007 participants ≥6 months to <5 years of age who received 3 doses of BNT162b2 3 µg

As measured at the central laboratory

SSB - noninferiority with respect to seroresponse rate to the Omicron BA.4/BA.5 strain in participants ≥6 months to <5 years of age
at 1 month after Dose 4 for Group 2 participants who received 3 prior doses of BNT162b2 3 µg and a fourth dose of bivalent BNT162b2 to 1 month after Dose 3 in Study C4591007 participants ≥6 months to <5 years of age who received 3 doses of BNT162b2 3 µg

As measured at the central laboratory

Substudy C (SSC) - Ph 1 dose finding, percentage of participants reporting local reactions
for up to 7 days following Dose 1

Participants ≥6 months to \<2 years of age: tenderness at the injection site, redness, and swelling as self-reported on electronic diaries Participants ≥2 to \<5 years of age: pain at the injection site, redness, and swelling as self-reported on electronic diaries

SSC - Ph 1 dose finding, percentage of participants reporting systemic events
for up to 7 days following Dose 1

Participants ≥6 months to \<2 years of age: fever, decreased appetite, drowsiness, and irritability as self-reported on electronic diaries Participants ≥2 to \<5 years of age: fever, fatigue, headache, chills, vomiting, diarrhea, new or worsened muscle pain, and new or worsened joint pain as self-reported on electronic diaries

SSC - Ph 1 dose finding, percentage of participants reporting adverse events
1 month after Dose 1

as elicited by investigational site staff

SSC - Ph 1 dose finding, percentage of participants reporting serious adverse events
6 months after Dose 1

as elicited by investigational site staff

SSC - Ph 1 dose finding - geometric mean titers elicited by prophylactic bivalent BNT162b2 at each dose level given as a fourth dose in participants ≥6 months to <5 years of age
At baseline (before Dose 1) and 1 month after Dose 1

As measured at the central laboratory

SSC - Ph 1 dose finding - geometric mean fold rise elicited by prophylactic bivalent BNT162b2 at each dose level given as a fourth dose in participants ≥6 months to <5 years of age
At baseline (before Dose 1) and 1 month after Dose 1

As measured at the central laboratory

SSC - Ph 1 dose finding - percentage of participants with seroresponse elicited by prophylactic bivalent BNT162b2 at each dose level given as a fourth dose in participants ≥6 months to <5 years of age
At baseline (before Dose 1) and 1 month after Dose 1

As measured at the central laboratory

Substudy D (SSD) - percentage of participants reporting local reactions
for up to 7 days following Dose 1

pain at the injection site, redness, and swelling as self-reported on electronic diaries

SSD - percentage of participants reporting systemic events
for up to 7 days following Dose 1

fever, fatigue, headache, chills, vomiting, diarrhea, new or worsened muscle pain, and new or worsened joint pain as self-reported on electronic diaries

SSD - percentage of participants reporting adverse events
1 month after Dose 1

as elicited by investigational site staff

SSD - percentage of participants reporting serious adverse events
6 months after Dose 1

as elicited by investigational site staff

SSD - the ratio of the geometric mean of SARS-CoV-2 Omicron BA.4/BA.5-neutralizing titers in participants ≥5 to <12 years of age
at 1 month after Dose 4 for participants who received 3 prior doses of BNT162b2 10 μg and a fourth dose of bivalent BNT162b2 to those at 1 month after Dose 3 for Study C4591007 Phase 2/3 participants who received 3 doses of BNT162b2 10 μg

As measured at the central laboratory

SSD - difference in percentages of participants with seroresponse to the Omicron BA.4/BA.5 strain in participants ≥5 to <12 years of age
at 1 month after bivalent BNT162b2 as a fourth dose for participants who received 3 prior doses of BNT162b2 10 µg and at 1 month after a third dose of BNT162b2 10 µg for Study C4591007 Phase 2/3 participants who received 3 doses of BNT162b2 10 µg

As measured at the central laboratory

Substudy E (SSE) - percentage of participants reporting local reactions
for up to 7 days following Dose 1

pain at the injection site, redness, and swelling as self-reported on electronic diaries

SSE - percentage of participants reporting systemic events
for up to 7 days following Dose 1

fever, fatigue, headache, chills, vomiting, diarrhea, new or worsened muscle pain, and new or worsened joint pain as self-reported on electronic diaries

SSE - percentage of participants reporting adverse events
from Dose 1 to 1 month after Dose 1

as elicited by investigational site staff

SSE - percentage of participants reporting serious adverse events
from Dose 1 to 6 months after Dose 1

as elicited by investigational site staff

SSE - Ratio of the geometric mean of SARS-CoV-2 Omicron XBB.1.5-neutralizing titers
At 1 month after 1 dose of BNT162b2 (Omi XBB.1.5) 10 microgram in participants ≥5 to 12 years of age to 1 month after 1 dose of BNT162b2 (Omi XBB.1.5) 30 microgram in participants ≥12 years of age from study C4591054 Substudy A

As measured at the central laboratory

SSE - difference in percentage of participants with seroresponse to Omicron XBB.1.5
At 1 month after 1 dose of BNT162b2 (Omi XBB.1.5) 10 microgram in participants ≥5 to 12 years of age and 1 month after 1 dose of BNT162b2 (Omi XBB.1.5) 30 microgram in participants ≥12 years of age from study C4591054 Substudy A

As measured at the central laboratory

Secondary Endpoints

SSA - Ph 1 dose finding, geometric mean titers elicited by prophylactic variant-adapted BNT162b2 at each dose level and variant vaccine type (if applicable) in COVID-19 vaccine-naïve participants ≥6 months to <5 years of age
At baseline (before Dose 1), 1 month after Dose 2, 1 month after Dose 3, and 1 month after Dose 4
SSA - Ph 1 dose finding, geometric mean fold rise elicited by prophylactic variant-adapted BNT162b2 at each dose level and variant vaccine type (if applicable) in COVID-19 vaccine-naïve participants ≥6 months to <5 years of age
At baseline (before Dose 1), 1 month after Dose 2, and 1 month after Dose 3
SSA - Ph 1 dose finding, percentage of participants with seroresponse elicited by prophylactic variant-adapted BNT162b2 at each dose level and variant-adapted vaccine type in COVID-19 vaccine-naïve participants ≥6 months to <5 years of age
At baseline (before Dose 1), 1 month after Dose 2, and 1 month after Dose 3
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
3 microgram dose, 6 Months to <2 Years (Substudy A, Phase 1)EXPERIMENTALInjection in the muscle at 0-, 3-, and 11-weeks and approximately 6-months post-Dose 3
6 microgram dose, 6 Months to <2 Years (Substudy A, Phase 1)EXPERIMENTALInjection in the muscle at 0-, 3-, and 11-weeks and approximately 6-months post-Dose 3
10 microgram dose, 6 Months to <2 Years (Substudy A, Phase 1)EXPERIMENTALInjection in the muscle at 0-, 3-, and 11-weeks and approximately 6-months post-Dose 3
10 microgram dose, 6 Months to <2 Years (Substudy A, Phase 2/3, Group 1) - 0/8 week scheduleEXPERIMENTALInjection in the muscle at 0- and 8-weeks
10 microgram dose, 6 Months to <2 Years (Substudy A, Phase 2/3, Group 2) - 0/8 week scheduleEXPERIMENTALInjection in the muscle at 0- and 8-weeks
3 microgram dose, 6 Months to <4 Years 6 Months (Substudy B, Group 1)EXPERIMENTALInjection in the muscle, 2 doses 2 months apart
3 microgram dose, 6 Months to <5 Years (Substudy B, Group 2)EXPERIMENTALInjection in the muscle, 1 dose
3 microgram dose, 6 Months to <5 Years (Substudy B, Group 3)EXPERIMENTALInjection in the muscle, 1 dose
6 microgram dose, 6 Months to <2 Years (Substudy C, Phase 1)EXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 6 Months to <2 Years (Substudy C, Phase 1)EXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 5 to <12 Years (Substudy D, Group 1)EXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 5 to <12 Years (Substudy D, Group 2)EXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 5 to <12 Years (Substudy D, Group 3)EXPERIMENTALInjection in the muscle, 1 dose
3 microgram dose, 2 Years to <4 years 3 months (Substudy A, Phase 1)EXPERIMENTALInjection in the muscle at 0-, 3-, and 11-weeks and approximately 6-months post-Dose 3
6 microgram dose, 2 Years to <4 years 3 months (Substudy A, Phase 1)EXPERIMENTALInjection in the muscle at 0-, 3-, and 11-weeks and approximately 6-months post-Dose 3
10 microgram dose, 2 Years to <4 years 3 months (Substudy A, Phase 1)EXPERIMENTALInjection in the muscle at 0-, 3-, and 11-weeks and approximately 6-months post-Dose 3
6 microgram dose, 2 Years to <5 Years (Substudy C, Phase 1)EXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 2 Years to <5 Years (Substudy C, Phase 1)EXPERIMENTALInjection in the muscle, 1 dose
3 microgram dose, 6 Months to <2 Years (Substudy A, Phase 2/3, Group 3) - 0/3/11 week scheduleEXPERIMENTALInjection in the muscle at 0-, 3-, and 11-weeks
10 microgram dose, 2 to <5 Years (Substudy A, Phase 2/3, Group 4) - Single doseEXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 2 to <5 Years (Substudy A, Phase 2/3, Group 5) - Single doseEXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 5 Years to <12 Years (Substudy E, Group 2)EXPERIMENTALInjection in the muscle, 1 dose
10 microgram dose, 6 months to <2 years (Substudy A Phase 2/3, Group 6) - 0/8 week scheduleEXPERIMENTALInjection in the muscle at 0- and 8-weeks

Interventions

NameTypeDescription
Bivalent BNT162b2 (original/Omicron BA.4/BA.5) 3 microgram doseBIOLOGICALInjection in the muscle
Bivalent BNT162b2 (original/Omicron BA.4/BA.5) 6 microgram doseBIOLOGICALInjection in the muscle
Bivalent BNT162b2 (original/Omicron BA.4/BA.5) 10 microgram doseBIOLOGICALInjection in the muscle
Variant-adapted BNT162b2 (Omicron XBB.1.5) 3 microgram doseBIOLOGICALInjection in the muscle
Variant-adapted BNT162b2 (Omicron XBB.1.5) 6 microgram doseBIOLOGICALInjection in the muscle
Variant-adapted BNT162b2 (Omicron XBB.1.5) 10 microgram doseBIOLOGICALinjection in the muscle
Variant-adapted BNT162b2 (Omicron KP.2) 10 microgram doseBIOLOGICALInjection in the muscle
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Eligibility Criteria

Age Range6 Months to 11 Years
SexALL
Healthy VolunteersYes
Study Sites96

Substudy A Inclusion Criteria: * Phase 1: Healthy male or female participants ≥6 months to \<4 years 3 months of age, at the time of randomization. * Phase 2/3: Healthy male or female participants ≥6 months to \<5 years of age at the time of randomization/enrollment. Exclusion Criteria: * Previo...

Countries:United StatesBrazilMexicoPuerto RicoSouth Africa
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Recent Changes (Last 90 Days)

MEDIUMSep 6, 2026NCT05543616TRIAL_REMOVED: changed
MEDIUMSep 6, 2026NCT05543616TRIAL_REMOVED: changed
MEDIUMSep 6, 2026NCT05543616TRIAL_REMOVED: changed
HIGHAug 6, 2026NCT05543616Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 6, 2026NCT05543616Status: ACTIVE_NOT_RECRUITING → COMPLETED

Frequently asked questions about Bivalent BNT162b2 3 microgram dose

What is Bivalent BNT162b2 3 microgram dose?

Bivalent BNT162b2 3 microgram dose is an investigational COVID-19 vaccine candidate developed by BioNTech SE. It is designed to protect against SARS-CoV-2 and was studied in healthy children. The 3 microgram dose refers to the amount of mRNA in each dose. It is not yet approved and remains in clinical development.

What is Bivalent BNT162b2 3 microgram dose used for?

Bivalent BNT162b2 3 microgram dose is being studied for the prevention of COVID-19 caused by SARS-CoV-2. The Phase 3 trial enrolled healthy children to evaluate the vaccine candidate. It targets the original SARS-CoV-2 strain and the Omicron BA.4/BA.5 variants.

Who makes Bivalent BNT162b2 3 microgram dose?

Bivalent BNT162b2 3 microgram dose is developed by BioNTech SE, which trades on the Nasdaq under the ticker BNTX. BioNTech is the sponsor of the clinical trial evaluating this vaccine candidate.

What phase is Bivalent BNT162b2 3 microgram dose in?

Bivalent BNT162b2 3 microgram dose is in Phase 3 clinical development. The trial has been completed, and the vaccine candidate is not approved. It remains investigational.

What clinical trials is Bivalent BNT162b2 3 microgram dose in?

Bivalent BNT162b2 3 microgram dose was evaluated in a single Phase 3 trial, NCT05543616, titled "A Study to Learn About Variant-Adapted COVID-19 RNA Vaccine Candidate(s) in Healthy Children." The trial enrolled 4,338 participants across the United States, Brazil, Mexico, Puerto Rico, and South Africa, and is now completed.