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Multivalent Group B streptococcus vaccine

Phase 3

Healthy | Monoclonal antibody | Other |Pfizer, Inc.|Last Updated: Aug 24, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment6,000

FDA Designations

No designations recorded

Clinical trial landscape

Multivalent Group B streptococcus vaccine · 4 trials · 3 indications

Phase 3 1Phase 2 3
NCT07160244BEATRIX: A Study to Learn About a Group B Streptococcus Vaccine in Healthy Pregnant Women and Their BabiesHealthy
RECRUITING6,000 Analytics
PHASE3RECRUITING
BEATRIX: A Study to Learn About a Group B Streptococcus Vaccine in Healthy Pregnant Women and Their Babies
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Study Endpoints

Primary Endpoints

The proportion of maternal participants reporting prespecified local reactions within 7 days following study intervention
Within 7 days
The proportion of maternal participants reporting prespecified systemic events within 7 days following study intervention
Within 7 days
The proportion of maternal participants reporting adverse events (AEs) through 1 month following study intervention
1 month
The proportion of maternal participants reporting serious adverse events (SAEs) through 6 months after delivery
6 months after delivery
The proportion of maternal participants reporting medically attended adverse events (MAAEs) through 6 months after delivery
6 months after delivery
The proportion of maternal participants reporting adverse events of special interest (AESIs) through 6 months after delivery.
6 months after delivery
The proportion of infant participants born to pregnant women who were vaccinated with GBS6 during pregnancy reporting adverse events (AEs) from birth through 1 month of age
Birth to 1 month of age
The proportion of infant participants born to pregnant women who were vaccinated with GBS6 during pregnancy reporting serious adverse events (SAEs) from birth through end of the study
Through study completion, at least 1 year
The proportion of infant participants born to pregnant women who were vaccinated with GBS6 during pregnancy reporting medically attended adverse events (MAAEs) from birth through 6 months of age
Birth to 6 months of age
The proportion of infant participants born to pregnant women who were vaccinated with GBS6 during pregnancy reporting adverse events of special interest (AESIs) from birth through end of study
Through study completion, at least 1 year
To measure the relative risk reduction in the proportion of infant participants at birth with GBS serotype-specific IgG antibody concentrations below predefined serotype-specific GBS late onset disease thresholds in the GBS6 group to the placebo group
Birth
To measure the relative risk reduction in the proportion of infant participants at birth with GBS serotype-specific IgG antibody concentrations below predefined serotype-specific GBS early onset disease thresholds in the GBS6 group to the placebo group
Birth
To evaluate the aggregate predicted VE combining all 6 serotypes in GBS6 to provide protection from invasive GBS late onset disease based on serotype specific anti-CPS IgG concentrations measured in infants at birth.
Birth
To evaluate the aggregate predicted VE combining all 6 serotypes in GBS6 to provide protection from invasive GBS early onset disease based on serotype specific anti-CPS IgG concentrations measured in infants at birth.
Birth
Percentage of Participants Reporting Local Reactions Within 7 Days After Vaccination
Day 1 (day of vaccination) to Day 7

Local reactions (redness, swelling, and pain at the injection site of the left arm) were recorded by participants in e-diary. Erythema/Redness and induration/swelling were measured and recorded in measuring device units (1 measuring device unit=0.5 centimeter \[cm\]). Grading: Grade 1/mild (greater than \[\>\] 2.0 to 5.0 cm), Grade 2/moderate (\>5.0 to 10.0 cm), Grade 3/severe (\>10.0 cm) and Grade 4 (necrosis \[swelling\] or necrosis or exfoliative dermatitis \[redness\]). Pain at injection site was graded as Grade 1/mild (did not interfere with activity), Grade2/moderate (interfered with activity), Grade 3/severe (prevented daily activity) and Grade 4 (emergency room \[ER\] visit or hospitalization for severe pain at injection site). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Systemic Reactions Within 7 Days After Vaccination
Day 1 (day of vaccination) to Day 7

Systemic events were recorded in e-diary. Fever: oral temperature greater than or equal to (\>=) 38.0 degree Celsius (deg C) and categorized as \>=38.0-38.4 deg C, \>38.4-38.9 deg C, \>38.9-40.0 deg C and \>40.0 deg C. Nausea/vomiting was graded as: Grade 1/mild (1-2 times in 24 hours \[h\]), Grade 2/moderate: (\>2 times in 24h), Grade 3/severe (required intravenous hydration) and Grade 4 (ER visit/hospitalization for hypotensive shock). Diarrhea was graded as: Grade 1/mild (2-3 loose stools in 24h), Grade 2/moderate (4-5 loose stools in 24h), Grade 3/severe (6 or more loose stools in 24h) and Grade 4 (ER visit/hospitalization for severe diarrhea). Fatigue/tiredness, headache, chills, muscle pain and joint pain were graded as: Grade 1/mild (did not interfere with activity), Grade 2/moderate (some interference with activity), Grade 3/severe (prevented daily routine activity) and Grade 4 (ER visit/hospitalization). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Adverse Events (AEs) Through 1 Month After Vaccination
Day 1 (day of vaccination) through 1 Month post-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. In this outcome measure results excluded data for local reactions and systemic events.

Percentage of Participants Reporting Medically Attended Adverse Events (MAEs) and Serious Adverse Events (SAEs) Through 6 Months After Vaccination
Day 1 (day of vaccination) through 6 Months post-vaccination

A MAE was defined as a non-serious AE that resulted in an evaluation at a medical facility. A SAE was defined as any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening (immediate risk of death); required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); congenital anomaly/birth defect; or that was considered as an important medical event.

Percentage of Participants Achieving Anti-tetanus Toxoid (Anti-TTd) and Anti-diphtheria Toxoid (Anti-DTd) Antibody Concentration >=0.1 IU/mL at 1 Month After Vaccination: GBS6 + Tdap and Placebo + Tdap Groups
1 Month after Vaccination (Day 1, day of vaccination)

IU/mL stands for international units per milliliter.

Geometric Mean Concentration (GMC) of Anti-Pertussis Toxin (PT), Anti-Filamentous Hemagglutinin (FHA), and Anti-Pertactin (PRN) Antibodies; GMR of Anti-PT, Anti-FHA, and Anti-PRN for GBS6 + Tdap to Placebo + Tdap at 1 Month After Vaccination
1 Month after Vaccination (Day 1, day of vaccination)

GMCs of anti-PT, anti-FHA, and anti-PRN was reported as descriptive data for the GBS6 +Tdap and placebo + Tdap groups, along with associated 2-sided 95% confidence interval. GMR for anti-PT, anti-FHA and anti-PRN antibodies were estimated from the GBS6 + Tdap group to the placebo + Tdap group and reported as statistical data.

GMC of GBS Capsular Polysaccharide (CPS) Serotype-Specific Immunoglobulin G (IgG) Antibodies; GMR of GBS CPS Serotype-specific IgG Antibodies for GBS6 + Tdap to Placebo + Tdap at 1 Month After Vaccination
1 Month after Vaccination (Day 1, day of vaccination)

GBS CPS serotype-specific IgG GMCs (Ia, Ib, II, III, IV, V) were reported as descriptive data for the GBS6+Tdap and GBS6+placebo groups, along with associated 2-sided 95% confidence interval. GMR of GBS CPS serotype-specific IgG antibodies were estimated from the GBS6 + Tdap group to the placebo + Tdap group and reported as statistical data.

Percentage of Participants Reporting Local Reactions Within 7 Days After Primary Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) to Day 7 after Primary Dose

Local reactions (redness, swelling, and pain at the injection site of the left arm) were recorded by participants in e-diary. Erythema/Redness and induration/swelling were measured and recorded in measuring device units (1 measuring device unit=0.5 centimeter \[cm\]). Grading: Grade 1/mild (greater than \[\>\] 2.5 to 5.0 cm), Grade 2/moderate (\>5.0 to 10.0 cm), Grade 3/severe (\>10.0 cm) and Grade 4 (necrosis \[swelling\] or necrosis or exfoliative dermatitis \[redness\]). Pain at injection site was graded as Grade 1/mild (did not interfere with activity), Grade2/moderate (interfered with activity), Grade 3/severe (prevented daily activity) and Grade 4 (emergency room \[ER\] visit or hospitalization for severe pain at injection site). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Local Reactions Within 7 Days After Booster Dose: Non-Pregnant Women Stage 1
Day 1 (day of vaccination) to Day 7 after booster dose

Local reactions (redness, swelling, and pain at the injection site of the left arm) were recorded by participants in e-diary. Erythema/Redness and induration/swelling were measured and recorded in measuring device units (1 measuring device unit=0.5 centimeter \[cm\]). Grading: Grade 1/mild (greater than \[\>\] 2.5 to 5.0 cm), Grade 2/moderate (\>5.0 to 10.0 cm), Grade 3/severe (\>10.0 cm) and Grade 4 (necrosis \[swelling\] or necrosis or exfoliative dermatitis \[redness\]). Pain at injection site was graded as Grade 1/mild (did not interfere with activity), Grade2/moderate (interfered with activity), Grade 3/severe (prevented daily activity) and Grade 4 (emergency room \[ER\] visit or hospitalization for severe pain at injection site). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Systemic Events Within 7 Days After Primary Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) to Day 7 after primary dose

Systemic events were recorded in e-diary. Fever: oral temperature greater than or equal to (\>=) 38.0 degree Celsius (deg C) and categorized as \>=38.0-38.4 deg C, \>38.4-38.9 deg C, \>38.9-40.0 deg C and \>40.0 deg C. Nausea/vomiting was graded as: Grade 1/mild (1-2 times in 24 hours \[h\]), Grade 2/moderate: (\>2 times in 24h), Grade 3/severe (required intravenous hydration) and Grade 4 (ER visit/hospitalization for hypotensive shock). Diarrhea was graded as: Grade 1/mild (2-3 loose stools in 24h), Grade 2/moderate (4-5 loose stools in 24h), Grade 3/severe (6 or more loose stools in 24h) and Grade 4 (ER visit/hospitalization for severe diarrhea). Fatigue/tiredness, headache, muscle pain and joint pain were graded as: Grade 1/mild (did not interfere with activity), Grade 2/moderate (some interference with activity), Grade 3/severe (prevented daily routine activity) and Grade 4 (ER visit/hospitalization). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Systemic Events Within 7 Days After Booster Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) to Day 7 after booster dose

Systemic events were recorded in e-diary. Fever: oral temperature greater than or equal to (\>=) 38.0 degree Celsius (deg C) and categorized as \>=38.0-38.4 deg C, \>38.4-38.9 deg C, \>38.9-40.0 deg C and \>40.0 deg C. Nausea/vomiting was graded as: Grade 1/mild (1-2 times in 24 hours \[h\]), Grade 2/moderate: (\>2 times in 24h), Grade 3/severe (required intravenous hydration) and Grade 4 (ER visit/hospitalization for hypotensive shock). Diarrhea was graded as: Grade 1/mild (2-3 loose stools in 24h), Grade 2/moderate (4-5 loose stools in 24h), Grade 3/severe (6 or more loose stools in 24h) and Grade 4 (ER visit/hospitalization for severe diarrhea). Fatigue/tiredness, headache, muscle pain and joint pain were graded as: Grade 1/mild (did not interfere with activity), Grade 2/moderate (some interference with activity), Grade 3/severe (prevented daily routine activity) and Grade 4 (ER visit/hospitalization). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Adverse Events (AEs) Through 1 Month After Primary Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) through 1 Month post primary dose

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency.

Percentage of Participants Reporting AEs Through 1 Month After Booster Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) through 1 Month post booster dose

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency.

Percentage of Participants Reporting Medically Attended Adverse Events (MAEs) Through 6 Months After Primary Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) through 6 Months post primary dose

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A MAE was defined as a non-serious AE that resulted in an evaluation at a medical facility.

Percentage of Participants Reporting Serious Adverse Events (SAEs) Through 6 Months After Primary Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) through 6 Months post primary dose

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A SAE was defined as any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening (immediate risk of death); required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); congenital anomaly/birth defect; or that was considered as an important medical event.

Percentage of Participants Reporting MAEs Approximately 7 to 12 Months After Booster Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) through approximately 7 to 12 months post booster dose

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A MAE was defined as a non-serious AE that resulted in an evaluation at a medical facility.

Percentage of Participants Reporting SAEs Approximately 7 to 12 Months After Booster Dose: Non-Pregnant Participants Stage 1
Day 1 (day of vaccination) through approximately 7 to 12 months post booster dose

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A SAE was defined as any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening (immediate risk of death); required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); congenital anomaly/birth defect; or that was considered as an important medical event.

Number of Participants With Clinical Laboratory Abnormalities at 2 Week Follow-up Visit: Maternal Participants Stage 2
2 weeks after vaccination in Stage 2

Hemoglobin: Grade 1, Platelets High: Grade 2, White blood cells decreased: Grade 1, Neutrophils (Absolute): Grade 1, Basophils (Absolute): Grade 2, Lymphocytes Low (Absolute): Grade1, Blood urea nitrogen (bun): Grade 1, Aspartate aminotransferase (AST): Grade 2, Alanine aminotransferase (ALT): Grade 1 and 3 and Alkaline phosphate: Grade 1. Grades were considered as 1: mild, 2: moderate, 3: severe. Only categories with non-zero values were reported for this outcome measure.

Percentage of Participants Reporting Local Reactions Within 7 Days After Vaccination: Maternal Participants Stage 2
Day 1 (day of vaccination) to Day 7 after Vaccination

Local reactions (redness, swelling, and pain at the injection site of the left arm) were recorded by participants in e-diary. Erythema/Redness and induration/swelling were measured and recorded in measuring device units (1 measuring device unit=0.5 cm). Grading: Grade 1/mild (\> 2.5 to 5.0 cm), Grade 2/moderate (\>5.0 to 10.0 cm), Grade 3/severe (\>10.0 cm) and Grade 4 (necrosis \[swelling\] or necrosis or exfoliative dermatitis \[redness\]). Pain at injection site was graded as Grade 1/mild (did not interfere with activity), Grade2/moderate (interfered with activity), Grade 3/severe (prevented daily activity) and Grade 4 (ER visit or hospitalization for severe pain at injection site). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Local Reactions Within 7 Days After Vaccination: Maternal Participants Stage 3
Day 1 (day of vaccination) to Day 7 after Vaccination

Local reactions (redness, swelling, and pain at the injection site of the left arm) were recorded by participants in e-diary. Erythema/Redness and induration/swelling were measured and recorded in measuring device units (1 measuring device unit=0.5 cm). Grading: Grade 1/mild (\> 2.5 to 5.0 cm), Grade 2/moderate (\>5.0 to 10.0 cm), Grade 3/severe (\>10.0 cm) and Grade 4 (necrosis \[swelling\] or necrosis or exfoliative dermatitis \[redness\]). Pain at injection site was graded as Grade 1/mild (did not interfere with activity), Grade2/moderate (interfered with activity), Grade 3/severe (prevented daily activity) and Grade 4 (ER visit or hospitalization for severe pain at injection site). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Systemic Events Within 7 Days Following Administration of Investigational Product: Maternal Participants Stage 2
Day 1 (day of vaccination) to Day 7 after Vaccination

Systemic events were recorded in e-diary. Fever: oral temperature \>=38.0 deg C and categorized as \>=38.0-38.4 deg C, \>38.4-38.9 deg C, \>38.9-40.0 deg C and \>40.0 deg C. Nausea/vomiting was graded as: Grade 1/mild (1-2 times in 24 h), Grade 2/moderate: (\>2 times in 24h), Grade 3/severe (required intravenous hydration) and Grade 4 (ER visit/hospitalization for hypotensive shock). Diarrhea was graded as: Grade 1/mild (2-3 loose stools in 24h), Grade 2/moderate (4-5 loose stools in 24h), Grade 3/severe (6 or more loose stools in 24h) and Grade 4 (ER visit/hospitalization for severe diarrhea). Fatigue/tiredness, headache, muscle pain and joint pain were graded as: Grade 1/mild (did not interfere with activity), Grade 2/moderate (some interference with activity), Grade 3/severe (prevented daily routine activity) and Grade 4 (ER visit/hospitalization). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting Systemic Events Within 7 Days Following Administration of Investigational Product: Maternal Participants Stage 3
Day 1 (day of vaccination) to Day 7 after Vaccination

Systemic events were recorded in e-diary. Fever: oral temperature \>=38.0 deg C and categorized as \>=38.0-38.4 deg C, \>38.4-38.9 deg C, \>38.9-40.0 deg C and \>40.0 deg C. Nausea/vomiting was graded as: Grade 1/mild (1-2 times in 24 h), Grade 2/moderate: (\>2 times in 24h), Grade 3/severe (required intravenous hydration) and Grade 4 (ER visit/hospitalization for hypotensive shock). Diarrhea was graded as: Grade 1/mild (2-3 loose stools in 24h), Grade 2/moderate (4-5 loose stools in 24h), Grade 3/severe (6 or more loose stools in 24h) and Grade 4 (ER visit/hospitalization for severe diarrhea). Fatigue/tiredness, headache, muscle pain and joint pain were graded as: Grade 1/mild (did not interfere with activity), Grade 2/moderate (some interference with activity), Grade 3/severe (prevented daily routine activity) and Grade 4 (ER visit/hospitalization). Grade 4 were classified by investigator or medically qualified person.

Percentage of Participants Reporting AEs Through 1 Month After Administration of Investigational Product: Maternal Participants Stage 2
Day 1 (day of vaccination) through 1 Month post vaccination

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency.

Percentage of Participants Reporting AEs Through 1 Month After Administration of Investigational Product: Maternal Participants Stage 3
Day 1 (day of vaccination) through 1 Month post vaccination

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency.

Percentage of Participants With SAEs From Day 1 Through 12 Months Post-delivery: Maternal Participants Stage 2
Day 1 (day of vaccination) through 12 Month post delivery

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A SAE was defined as any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening (immediate risk of death); required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); congenital anomaly/birth defect; or that was considered as an important medical event.

Percentage of Participants With SAEs From Day 1 Through 12 Months Post-delivery: Maternal Participants Stage 3
Day 1 (day of vaccination) through 12 Month post delivery

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A SAE was defined as any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening (immediate risk of death); required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); congenital anomaly/birth defect; or that was considered as an important medical event.

Percentage of Participants With MAEs From Day 1 Through 12 Months Post-delivery: Maternal Participants Stage 2
Day 1 (day of vaccination) through 12 Month post delivery

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A MAE was defined as a non-serious AE that resulted in an evaluation at a medical facility.

Percentage of Participants With MAEs From Day 1 Through 12 Months Post-delivery: Maternal Participants Stage 3
Day 1 (day of vaccination) through 12 Month post delivery

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. Examples of AEs included but were not limited to abnormal test findings; clinically significant signs and symptoms; changes in physical examination findings; hypersensitivity; progression/worsening of underlying disease; drug abuse; drug dependency. A MAE was defined as a non-serious AE that resulted in an evaluation at a medical facility.

Percentage of Participants With Obstetric Complications From Visit 1 Through 12 Months Post-delivery: Maternal Participants Stage 2
Day 1 (day of vaccination) through 12 Month post delivery

Obstetric complications such as: prepartum period, intrapartum period and postpartum period were reported in this outcome measure.

Percentage of Participants With Obstetric Complications From Day 1 Through 12 Months Post-delivery: Maternal Participants Stage 3
Day 1 (day of vaccination) through 12 Month post delivery

Obstetric complications such as: prepartum period, intrapartum period and postpartum period were reported in this outcome measure.

Percentage of Participants With Each Delivery Outcome and Delivery Mode: Maternal Participants Stage 2
At delivery

Delivery Outcome included full term live delivery, premature live delivery, Stillbirth, induced/elective abortion and unknown. Mode of delivery included: vaginal delivery, Cesarean section: elective, semi-elective and emergency were reported in this outcome measure.

Percentage of Participants With Each Delivery Outcome and Delivery Mode: Maternal Participants Stage 3
At delivery

Delivery Outcome included full term live delivery, premature live delivery, Stillbirth, induced/elective abortion and unknown. Mode of delivery included: vaginal delivery, Cesarean section: elective, semi-elective and emergency were reported in this outcome measure.

Percentage of Participants With Gestational Age at Birth: Infant Participants Stage 2
At Birth

Gestational age of participants at birth in weeks included: greater than or equal to (\>=)24 weeks to less than (\<) 28 weeks, \>=28 weeks to \<34 weeks, \>=34 weeks to \<37 weeks, \>=37 weeks to \<42 weeks, \>=42 weeks.

Appearance, Pulse, Grimace, Activity, and Respiration (APGAR) Score at 1 Minute: Infant Participants Stage 2
At 1 minute of Birth

APGAR is a scoring system that evaluates Activity, Pulse, Grimace, Appearance, and Respiration. Each category is given a score of 0-2 points (with 0 being absent and 2 being normal), the points are then combined for a total score that ranges from 0-10. Scores 7 and above are generally normal, 4 to 6 are fairly low, and 2 and below are considered critically low. APGAR score at 1 minute were reported in this outcome measure.

Appearance, Pulse, Grimace, Activity, and Respiration (APGAR) Score at 5 Minutes: Infant Participants Stage 2
At 5 minutes of Birth

APGAR is a scoring system that evaluates Activity, Pulse, Grimace, Appearance, and Respiration. Each category is given a score of 0-2 points (with 0 being absent and 2 being normal), the points are then combined for a total score that ranges from 0-10. Scores 7 and above are generally normal, 4 to 6 are fairly low, and 2 and below are considered critically low. APGAR score at 5 minute were reported in this outcome measure.

Number of Participants According to Age Determined by Ballard Score: Infant Participants Stage 2
At Birth

The Ballard score is a commonly used technique of gestational age assessment. It assists healthcare providers in determining if an infant is premature, on time, or post-term based on physical traits. This scoring allows for the estimation of age in the range of 26 weeks to 44 weeks Participants according to age determined by Ballard score: at \<37 weeks 0 days, \>=37 weeks to \<42 weeks, \>=42 weeks were reported in this outcome measure. Ballard score was not conducted routinely/mandatory.

Number of Participants With Newborn Assessment at Birth: Infant Participants Stage 2
At Birth

Participants with newborn assessment at birth included: normal, congenital malformation/anomaly, other neonatal problem were reported in this outcome measure.

Number of Participants With Vital Status: Infant Participants Stage 2
At Birth

Participants according to vital status as: live or neonatal death were reported in this outcome measure.

Number of Participants With Gestational Age of Participants at Birth: Infant Participants Stage 3
At 1 minute of Birth

Gestational age of participants at birth in weeks included: greater than or equal to (\>=)24 weeks to less than (\<) 28 weeks, \>=28 weeks to \<34 weeks, \>=34 weeks to \<37 weeks, \>=37 weeks to \<42 weeks, \>=42 weeks.

Appearance, Pulse, Grimace, Activity, and Respiration (APGAR) Score at 1 Minute: Infant Participants Stage 3
At 1 minute of Birth

APGAR is a scoring system that evaluates Activity, Pulse, Grimace, Appearance, and Respiration. Each category is given a score of 0-2 points (with 0 being absent and 2 being normal), the points are then combined for a total score that ranges from 0-10. Scores 7 and above are generally normal, 4 to 6 are fairly low, and 2 and below are considered critically low. Appearance, pulse, grimace, activity, and respiration (APGAR) score at 1 minute were reported in this outcome measure.

APGAR Score at 5 Minutes: Infant Participants Stage 3
At 5 minutes of Birth

APGAR is a scoring system that evaluates Activity, Pulse, Grimace, Appearance, and Respiration. Each category is given a score of 0-2 points (with 0 being absent and 2 being normal), the points are then combined for a total score that ranges from 0-10. Scores 7 and above are generally normal, 4 to 6 are fairly low, and 2 and below are considered critically low. Appearance, pulse, grimace, activity, and respiration (APGAR) score at 5 minute were reported in this outcome measure.

Number of Participants According to Age Determined by Ballard Score: Infant Participants Stage 3
At Birth

The Ballard score is a commonly used technique of gestational age assessment. It assists healthcare providers in determining if an infant is premature, on time, or post-term based on physical traits. This scoring allows for the estimation of age in the range of 26 weeks to 44 weeks Participants according to age determined by Ballard score: at \<37 weeks 0 days, \>=37 weeks to \<42 weeks, \>=42 weeks were reported in this outcome measure. Ballard score was not conducted routinely/mandatory.

Number of Participants With Newborn Assessment at Birth: Infant Participants Stage 3
At 5 minutes of Birth

Participants with newborn assessment at birth included: normal, congenital malformation/anomaly, other neonatal problem were reported in this outcome measure.

Number of Participants With Vital Status: Infant Participants Stage 3
At Birth

Participants according to vital status as: live or neonatal death were reported in this outcome measure.

Number of Participants With AEs From Birth to 6 Weeks of Age: Infant Participants Stage 2
From Birth to 6 Weeks

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage.

Numberof Participants With AEs From Birth to 6 Weeks of Age: Infant Participants Stage 3
From Birth to 6 Weeks

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage.

Number of Participants With SAEs From Birth to 12 Months of Age: Infant Participants Stage 2
From Birth to 12 Months

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. A SAE was defined as any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening (immediate risk of death); required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); congenital anomaly/birth defect; or that was considered as an important medical event.

Number of Participants With SAEs From Birth to 12 Months of Age: Infant Participants Stage 3
From Birth to 12 Months

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. A SAE was defined as any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening (immediate risk of death); required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); congenital anomaly/birth defect; or that was considered as an important medical event.

Number of Participants With MAEs From Birth to 12 Months of Age: Infant Participants Stage 2
From Birth to 12 Months

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. A MAE was defined as a non-serious AE that resulted in an evaluation at a medical facility.

Number of Participants With MAEs From Birth to 12 Months of Age: Infant Participants Stage 3
From Birth to 12 Months

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. A MAE was defined as a non-serious AE that resulted in an evaluation at a medical facility.

Percentage of Participants With Adverse Events of Special Interest From Birth to 12 Months of Age: Infant Participants Stage 2
From Birth to 12 Months

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. AEs of special interest included: major congenital anomalies, developmental delay and suspected or confirmed GBS infection.

Percentage of Participants With Adverse Events of Special Interest From Birth to 12 Months of Age: Infant Participants Stage 3
From Birth to 12 Months

An AE was any untoward medical occurrence in a study participant administered a study intervention or medical device; the event need not necessarily had a causal relationship with the treatment or usage. AEs of special interest included: major congenital anomalies, developmental delay and suspected or confirmed GBS infection.

Percentage of Participants With Clinical Laboratory Abnormalities at 1-Week After Vaccination as Measured by Food and Drug Administration (FDA) Grade
1 week after vaccination

Hemoglobin:Grade(G)1: 11-13.5g/dL, G2:9.5-12.4g/dL,G3:8-10.4 g/dL, G4:\<8.0 g/dL; leukocyte increase:G1: 10.8-15\*10\^9/Liter\[L\],G2:\>15-20\*10\^9/L, G3:\>20-25\*10\^9/L, G4:\>25\*10\^9/L,leukocyte decrease: G1: 2.5-3.5\*10\^9/L, G2: 1.5-\<2.5\*10\^9/L, G3: 1-\<1.5\*10\^9/L, G4:\<1\*10\^9/L; neutrophil decrease:G1: 1.5-2\*10\^9/L, G2:1-\<1.5\*10\^9/L, G3:0.5-\<1\*10\^9/L,G4:\<0.5\*10\^9/L; platelets:G1: 125-140\*10\^9/L, G2:100-124\*10\^9/L, G3:25-99\*10\^9/L, G4:\<25\*10\^9/L; eosinophils: G1: 0.65-1.5\*10\^9/L, G2:\>1.5-5\*10\^9/L, G3:\>5\*10\^9/L, G4: hypereosinophilic;alanine aminotransferase,aspartate aminotransferase:G1: 1.1-2.5 \*ULN, G2:2.6-5.0\*ULN, G3:5.1-10\*ULN, G4:\>10\*ULN; alkaline phosphatase:G1: 1.1-2\*ULN, G2:2.1-3\*ULN, G3:3.1-10\*ULN, G4:\>10\*ULN; Bilirubin:G1: 1.1-1.5\*ULN, G2: 1.26-2\*ULN,G3: 1.51-3.0\*ULN,G4:\>1.75\*ULN;blood urea nitrogen:G1:23-26mg/dL,G2:27-31mg/dL,G3:\>31mg/dL, G4:dialysis;creatinine:G1:1.5-1.7mg/dL,G2:1.8-2mg/dL,G3:2.1-2.5 mg/dL,G4:dialysis.Categories with\>=1 participant with abnormality are reported only.

Percentage of Participants With Local Reactions by Maximum Severity Within 14 Days After Vaccination
Within 14 days after vaccination

Local reactions were collected by using an e-diary and included redness, swelling and pain at injection site. Redness and swelling were graded as: mild (2.5-5.0 centimeter \[cm\]), moderate (greater than \[\>\] 5.0-10.0 cm) and severe (\>10.0 cm), grade 4 for redness (necrosis or exfoliative dermatitis) and grade 4 for swelling (necrosis). Pain at injection site was graded as: mild (did not interfere with activity), moderate (repeated use of nonnarcotic pain reliever \>24 hours or interfered with activity), severe (any use of narcotic pain reliever or prevented daily activity which resulted in missed days of work or school or was otherwise incapacitating, or included use of narcotics for analgesia), and grade 4 (required emergency room visit or hospitalization). The maximum severity (highest grading) of each location reaction within 14 days of vaccination was derived.

Percentage of Participants With Systemic Events by Maximum Severity Within 14 Days After Vaccination
Within 14 days after vaccination

Fever:38.0-38.4 degree Celsius (C),38.5-38.9 degree C,39.0-40.0 degree C,\>40.0 degree C;nausea/vomiting:mild(not interfered with activity/1-2times in 24 hours\[hr\]),moderate(some interference with activity/\>2times in 24hr),severe(prevented daily activity;required intravenous hydration); diarrhea:mild(2-3 loose stools in 24hr),moderate(4-5 loose stools in 24hr),severe(\>=6 loose stools in 24 hr); headache:mild(not interfered with activity),moderate(repeated use of non-narcotic pain reliever \>24 hr/some interference with activity),severe(significant;any use of narcotic pain reliever/prevented daily activity);fatigue,muscle and joint pain:mild(not interfered with activity), moderate(some interference with activity),severe(significant;prevented daily activity).Prevented daily activity=missed days of work, school/otherwise incapacitating/use of narcotics for analgesia.Nausea/vomiting,diarrhea,headache,fatigue/tiredness,muscle and joint pain: grade 4=emergency room visit or hospitalization.

Percentage of Participants With Adverse Events (AEs) Within 1 Month After Vaccination
Within 1 month after vaccination

An AE was any untoward medical occurrence in a participant who received investigational product without regard to possibility of causal relationship. Serious adverse event (SAE) was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly or that was considered to be an important medical event. AEs included both non-serious AEs and SAEs.

Percentage of Participants With Serious Adverse Events (SAEs) Within 6 Month After Vaccination
Within 6 months after vaccination

An AE was any untoward medical occurrence in a participant in a participant who received investigational product without regard to possibility of causal relationship. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly or that was considered to be an important medical event.

Percentage of Participants With Medically Attended Adverse Events (MAEs) Within 6 Months After Vaccination
Within 6 months after vaccination

An AE was any untoward medical occurrence in a participant in a participant who received investigational product without regard to possibility of causal relationship. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly or that was considered to be an important medical event. An MAE was defined as a non serious AE (AE other than SAE) that resulted in an evaluation at a medical facility.

Secondary Endpoints

To measure GBS serotype-specific opsonophagocytic titers in infant participants at birth by geometric mean ratio between GBS6 group versus placebo group and by the difference in seroresponse rates between GBS6 group and placebo group
Birth
To describe anti-CPS IgG antibody levels predicted to provide protection from invasive GBS disease (all disease) caused by the 6 individual vaccine serotypes in infants when GBS6 is administered to healthy pregnant women.
Birth
To describe anti-CPS IgG antibody levels in infant participants born to maternal participants vaccinated with GBS6.
Birth
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
GBS6EXPERIMENTALMultivalent group B streptococcus vaccine
PlaceboPLACEBO_COMPARATORPlacebo
Infanrix hexaEXPERIMENTALCommercially available combination vaccine containing diphtheria, tetanus, pertussis (whooping cough), hepatitis B, poliomyelitis (polio), and Haemophilus influenzae type b (Hib)
Prevenar 20EXPERIMENTALCommercially available vaccine that protects against 20 strains of Streptococcus pneumoniae
PediarixEXPERIMENTALCommercially available combination vaccine containing diphtheria, tetanus, pertussis (whooping cough), hepatitis B, and polio
Prevnar 20EXPERIMENTALCommercially available vaccine that protects against 20 strains of Streptococcus pneumoniae
InfanrixEXPERIMENTALCommercially available combination vaccine containing diphtheria, tetanus, and pertussis
GBS6 and TdapEXPERIMENTALMultivalent group B streptococcus vaccine and Tetanus, diphtheria, and acellular pertussis vaccine (Tdap)
GBS6 and PlaceboEXPERIMENTALMultivalent group B streptococcus vaccine and Placebo
Placebo and TdapEXPERIMENTALPlacebo and Tetanus, diphtheria, and acellular pertussis vaccine (Tdap)
Stage 1 - Highest dose formulation aEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 1 Nonpregnant women
Stage 1 - Highest dose formulation bEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 1 Nonpregnant women
Stage 2 - Lowest dose formulation aEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 2 Pregnant women
Stage 2 - Lowest dose formulation bEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 2 Pregnant women
Stage 2 - Middle dose formulation aEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 2 Pregnant women
Stage 2 - Middle dose formulation bEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 2 Pregnant women
Stage 2 - Highest dose formulation aEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 2 Pregnant women
Stage 2 - Highest dose formulation bEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 2 Pregnant women
Stage 3 - Selected dose and formulationEXPERIMENTALMultivalent group B streptococcus vaccine - Stage 3 Pregnant women
Stage 1 PlaceboPLACEBO_COMPARATORSaline control
Stage 2 PlaceboPLACEBO_COMPARATORSaline control
Stage 3 PlaceboPLACEBO_COMPARATORSaline control
Lowest dose formulation aEXPERIMENTALMultivalent group B streptococcus vaccine
Middle dose formulation aEXPERIMENTALMultivalent group B streptococcus vaccine
Highest dose formulation aEXPERIMENTALMultivalent group B streptococcus vaccine
Lowest dose formulation bEXPERIMENTALMultivalent group B streptococcus vaccine
Middle dose formulation bEXPERIMENTALMultivalent group B streptococcus vaccine
Highest dose formulation bEXPERIMENTALMultivalent group B streptococcus vaccine

Interventions

NameTypeDescription
Multivalent Group B streptococcus vaccineBIOLOGICALMultivalent Group B streptococcus vaccine
PlaceboBIOLOGICALSaline Control
Infanrix hexaBIOLOGICALVaccine administered in a subset of infant participants as per the national immunization schedule
Prevenar 20BIOLOGICALVaccine administered in a subset of infant participants as per the national immunization schedule
PediarixBIOLOGICALVaccine administered in a subset of infant participants as per the national immunization schedule
Prevnar 20BIOLOGICALVaccine administered in a subset of infant participants as per the national immunization schedule
InfanrixBIOLOGICALVaccine administered in a subset of infant participants as per the national immunization schedule
Tetanus, diphtheria, and acellular pertussis vaccineBIOLOGICALTetanus, diphtheria, and acellular pertussis vaccine
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Eligibility Criteria

Age Range1 Day to 49 Years
SexALL
Healthy VolunteersYes
Study Sites206

Key Inclusion criteria- Maternal: * Healthy pregnant women ≤49 years of age who are between 24 0/7 and 36 0/7 weeks of gestation on the day of planned vaccination, with an uncomplicated, singleton pregnancy, and who have no known increased risk of complications. * Had a fetal anomaly ultrasound exa...

Countries:United StatesArgentinaBrazilCanadaFinlandJapanMexicoNetherlandsSouth AfricaSouth KoreaSpainTaiwanThe GambiaUnited Kingdom
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Recent Changes (Last 90 Days)

LOWAug 24, 2026NCT07160244lastUpdatePostDate: changed
LOWAug 24, 2026NCT07160244lastUpdatePostDate: changed
LOWAug 20, 2026NCT07160244lastUpdatePostDate: changed
LOWAug 20, 2026NCT07160244lastUpdatePostDate: changed
LOWJul 9, 2026NCT07160244lastUpdatePostDate: changed
LOWJul 9, 2026NCT07160244lastUpdatePostDate: changed
LOWJun 23, 2026NCT07160244lastUpdatePostDate: changed
LOWJun 23, 2026NCT07160244lastUpdatePostDate: changed
LOWJun 9, 2026NCT07160244lastUpdatePostDate: changed
LOWJun 9, 2026NCT07160244lastUpdatePostDate: changed
LOWJun 9, 2026NCT07160244lastUpdatePostDate: changed
LOWJun 9, 2026NCT07160244lastUpdatePostDate: changed

Frequently asked questions about Multivalent Group B streptococcus vaccine

What is the Multivalent Group B Streptococcus vaccine used for?

The Multivalent Group B Streptococcus vaccine is an investigational vaccine being developed to prevent Group B Streptococcus infections, including in pregnant women and their infants. It is also being studied in healthy adults and nonpregnant women. The vaccine is designed to generate an immune response against Group B Streptococcus bacteria.

Who makes the Multivalent Group B Streptococcus vaccine?

Pfizer, Inc. (NYSE: PFE) is developing the Multivalent Group B Streptococcus vaccine. The company is conducting clinical trials to evaluate the vaccine's safety, tolerability, and immunogenicity in various populations, including healthy adults, nonpregnant women, and pregnant women.

What phase is the Multivalent Group B Streptococcus vaccine in?

The Multivalent Group B Streptococcus vaccine is in Phase 2 clinical development. Several Phase 2 trials have been completed, and a Phase 3 trial, BEATRIX, is currently recruiting participants. The vaccine is investigational and has not been approved by regulatory authorities.

What clinical trials is the Multivalent Group B Streptococcus vaccine in?

The vaccine has been studied in several trials, including NCT03170609, NCT03765073, and NCT04766086, all Phase 2 and completed. A Phase 3 trial, NCT07160244 (BEATRIX), is currently recruiting to evaluate the vaccine in healthy pregnant women and their babies across multiple countries.

How does the Multivalent Group B Streptococcus vaccine work?

The Multivalent Group B Streptococcus vaccine is designed to target multiple serotypes of Group B Streptococcus bacteria. By presenting these bacterial components to the immune system, the vaccine aims to stimulate production of antibodies that can recognize and neutralize the bacteria, potentially preventing infection in vaccinated individuals.

Is the Multivalent Group B Streptococcus vaccine the same as GBS vaccine?

The Multivalent Group B Streptococcus vaccine is commonly referred to as a GBS vaccine, as it targets Group B Streptococcus. In clinical trials, it is described as a multivalent Group B Streptococcus vaccine, indicating it covers multiple strains of the bacteria.