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GBS6

Phase 2

Group B Streptococcus Infections | Vaccine | Infectious Disease |Pfizer, Inc.|Trials Updated: Aug 5, 2025

GBS6 target and mechanism

ModalityVaccine

Also known as Multivalent Group B streptococcus vaccine

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials3
Total Enrollment1,879

FDA Designations

No designations recorded

GBS6 clinical trials

GBS6 · 3 trials · 2 indications

Phase 2 3
NCT04766086Trial to Evaluate the Safety, Tolerability, and Immunogenicity of A Multivalent Group B Streptococcus Vaccine When Administered Concomitantly With Tdap in Healthy Nonpregnant WomenGroup B Streptococcus Infections
COMPLETED306 Analytics
NCT03765073Trial To Evaluate The Safety, Tolerability, And Immunogenicity Of A Multivalent Group B Streptococcus Vaccine In Healthy Nonpregnant Women And Pregnant Women And Their InfantsGroup B Streptococcus Infections
COMPLETED1,208 Analytics
NCT03170609A Phase 1/2, Randomized, Placebo-controlled, Observer-blinded Trial To Evaluate The Safety, Tolerability, And Immunogenicity Of A Multivalent Group B Streptococcus Vaccine In Healthy Adults 18 To 49 Years Of AgeGroup B Streptococcal Infections
COMPLETED365 Analytics
PHASE2COMPLETED
Trial to Evaluate the Safety, Tolerability, and Immunogenicity of A Multivalent Group B Streptococcus Vaccine When Administered Concomitantly With Tdap in Healthy Nonpregnant Women
Group B Streptococcus InfectionsUnlock trial analytics
PHASE2COMPLETED
Trial To Evaluate The Safety, Tolerability, And Immunogenicity Of A Multivalent Group B Streptococcus Vaccine In Healthy Nonpregnant Women And Pregnant Women And Their Infants
Group B Streptococcus InfectionsUnlock trial analytics
PHASE2COMPLETED
A Phase 1/2, Randomized, Placebo-controlled, Observer-blinded Trial To Evaluate The Safety, Tolerability, And Immunogenicity Of A Multivalent Group B Streptococcus Vaccine In Healthy Adults 18 To 49 Years Of Age
Group B Streptococcal InfectionsUnlock trial analytics

Study Endpoints

Primary Endpoints

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

Geometric Mean Concentration (GMCs) of Group B Streptococcus (GBS) Serotype-Specific Immunoglobulin G (IgG) at 1 Month After Primary Dose: Non-Pregnant Women Stage 1
At 1 Month After primary Dose
GMCs of GBS Serotype-specific IgG Before and 1 Month, 3 Months, and 6 Months After a Booster Dose: Non Pregnant Women Stage 1
Before (immediately before booster vaccination) and at 1, 3 and 6 Months After vaccination as Booster Dose
GMCs of GBS Serotype-specific IgG at 2 Weeks, 1 Month After Vaccination and at Delivery: Maternal Participants Stage 2
At 2 Weeks after Vaccination, 1 Month After Vaccination and at Delivery
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
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
PlaceboPLACEBO_COMPARATORSaline control

Interventions

NameTypeDescription
Multivalent Group B streptococcus vaccineBIOLOGICALMultivalent Group B streptococcus vaccine
Tetanus, diphtheria, and acellular pertussis vaccineBIOLOGICALTetanus, diphtheria, and acellular pertussis vaccine
PlaceboBIOLOGICALSaline control
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Eligibility Criteria

Age Range18 Years to 49 Years
SexFEMALE
Healthy VolunteersYes
Study Sites12

Inclusion Criteria: * Healthy women ≥18 and ≤49 years of age. * Participants who are willing and able to comply with scheduled visits, investigational plan, laboratory tests, lifestyle considerations, and other study procedures, including completion of the e-diary from Day 1 to Day 7 following admi...

Countries:United StatesSouth AfricaUnited Kingdom
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Frequently asked questions about GBS6

What is GBS6?

GBS6 is an investigational multivalent vaccine developed by Pfizer for the prevention of Group B streptococcal infections. It is designed to protect against Group B Streptococcus, a bacterium that can cause serious illness in newborns and adults. GBS6 is in Phase 2 clinical development and has been studied in healthy nonpregnant women, pregnant women, and their infants.

What is GBS6 used for?

GBS6 is being developed for the prevention of Group B Streptococcal infections. Group B Streptococcus can cause invasive disease in newborns and in adults with certain risk factors. The vaccine has been evaluated in clinical trials involving healthy nonpregnant women, pregnant women, and their infants, with the goal of preventing infection in these populations.

Who makes GBS6?

GBS6 is developed by Pfizer, Inc., which trades on the New York Stock Exchange under the ticker PFE. Pfizer is conducting the clinical development program for this multivalent Group B streptococcus vaccine candidate.

What phase is GBS6 in?

GBS6 is in Phase 2 clinical development. It is an investigational vaccine and has not been approved by the FDA. Two Phase 2 trials have been completed, and a Phase 1/2 trial has also been completed. No active trials are currently listed for GBS6.

What clinical trials is GBS6 in?

GBS6 has been studied in completed trials including NCT04766086, a Phase 2 trial in healthy nonpregnant women that evaluated the vaccine given with Tdap; NCT03765073, a Phase 2 trial in healthy nonpregnant and pregnant women and their infants; and NCT03170609, a Phase 1/2 trial in healthy adults aged 18 to 49.

Is GBS6 the same as the multivalent group B streptococcus vaccine?

Yes, GBS6 is also known as the multivalent group B streptococcus vaccine. These names refer to the same Pfizer vaccine candidate being developed to prevent Group B Streptococcal infections. The trials for GBS6 enrolled a total of 1,514 participants across the completed studies.