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dTpa

Phase 3

Diphtheria-Tetanus-acellular Pertussis Vaccines | Monoclonal antibody | Infectious Disease |GSK plc|Last Updated: Sep 9, 2026

Success Probability

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Trial Design

UNCONTROLLED
Total Trials2
Total Enrollment192

FDA Designations

No designations recorded

Clinical trial landscape

dTpa · 2 trials · 1 indication

Phase 3 2
NCT07596173A Study on the Immune Response and Safety of a Combined Vaccine Against Diphtheria, Tetanus and Acellular Pertussis (dTpa) in Healthy Japanese Adolescents Aged 11 Years to <13 YearsDiphtheria-Tetanus-acellular Pertussis Vaccines
COMPLETED90 Analytics
NCT07596199A Study on the Immune Response and Safety of a Combined Vaccine Against Diphtheria, Tetanus and Acellular Pertussis (dTpa) in Japanese Healthy Pregnant WomenDiphtheria-Tetanus-acellular Pertussis Vaccines
ACTIVE NOT_RECRUITING102 Analytics
PHASE3COMPLETED
A Study on the Immune Response and Safety of a Combined Vaccine Against Diphtheria, Tetanus and Acellular Pertussis (dTpa) in Healthy Japanese Adolescents Aged 11 Years to <13 Years
Diphtheria-Tetanus-acellular Pertussis VaccinesUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Study on the Immune Response and Safety of a Combined Vaccine Against Diphtheria, Tetanus and Acellular Pertussis (dTpa) in Japanese Healthy Pregnant Women
Diphtheria-Tetanus-acellular Pertussis VaccinesUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of seropositive participants for anti-pertussis toxin (anti-PT), anti-filamentous hemagglutinin (FHA) and anti-pertactin (PRN) antibodies
1 month after vaccination

Seropositivity is defined as antibody concentrations (anti-PT, anti-FHA and anti-PRN) are greater than or equal to the assessed assay cut-offs. The considered cut-off values are: anti-PT: 2.693 International Units per milliliter (IU/mL), anti-FHA: 2.046 IU/mL, anti-PRN: 2.187 IU/mL, as measured by Enzyme-Linked Immunosorbent assay (ELISA).

Number of seroprotected participants for anti-diphteria and anti-tetanus antibodies
1 month after vaccination

Seroprotection is defined as anti-diphtheria and anti- tetanus antibody concentrations being \>=0.1 IU/mL as measured by ELISA.

Number of seropositive healthy pregnant women for anti-pertussis toxin (PT), anti-filamentous hemagglutinin (FHA) and anti-pertactin (PRN) antibodies
At Month 1 post-vaccination

Seropositivity is defined as antibody concentrations (anti-PT, anti-FHA and anti-PRN) are greater than or equal to the assessed assay cut-offs. The considered cut-off values are: anti-PT: 2.693 International Units per milliliter (IU/mL), anti-FHA: 2.046 IU/mL, anti-PRN: 2.187 IU/mL, as measured by Enzyme-Linked Immunosorbent assay (ELISA).

Number of seropositive participants for anti-PT, anti-FHA and anti-PRN antibodies from samples in cord blood sample at birth
On the Day of birth

Secondary Endpoints

Number of participants with booster-response to pertussis (PT, FHA and PRN) antigens
1 month after vaccination
Antibody concentration against pertussis (PT, FHA, PRN) antigens
At baseline (Day 1) and 1 month after vaccination
Antibody concentration for anti-diphtheria and anti-tetanus antibodies
At baseline (Day 1) and 1 month after vaccination
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSINGLE_GROUP
PurposePREVENTION

Treatment Arms

ArmTypeDescription
dTpa GroupEXPERIMENTALParticipants aged 11 to less than (\<) 13 years receive the dTpa vaccine at Day 1.

Interventions

NameTypeDescription
dTpa vaccineBIOLOGICALCombined reduced antigen content diphtheria, tetanus and acellular pertussis (dTpa) vaccine administered at Day 1.
dTpaBIOLOGICAL1 dose of dTpa vaccine is administered intramuscularly.
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Eligibility Criteria

Age Range11 Years to 12 Years
SexALL
Healthy VolunteersYes
Study Sites10

Inclusion Criteria: * Participants and/or participants' parent(s)/ Legally acceptable representative(s) \[LAR(s)\], who, in the opinion of the investigator, can and will comply with the requirements of the protocol. * Physical or digital informed assent obtained from the participant prior to perfor...

Countries:Japan
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Recent Changes (Last 90 Days)

HIGHSep 9, 2026NCT07596173Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHSep 9, 2026NCT07596173Status: ACTIVE_NOT_RECRUITING → COMPLETED
MEDIUMSep 8, 2026NCT07596199Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMSep 8, 2026NCT07596199Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 17, 2026NCT07596173Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 17, 2026NCT07596173Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWJul 28, 2026NCT07596199Enrollment: 95 → 100
LOWJul 28, 2026NCT07596173Enrollment: 85 → 90
LOWJul 28, 2026NCT07596199Enrollment: 95 → 100
LOWJul 28, 2026NCT07596173Enrollment: 85 → 90
LOWJul 8, 2026NCT07596199Status: NOT_YET_RECRUITING → RECRUITING
LOWJul 8, 2026NCT07596173Status: NOT_YET_RECRUITING → RECRUITING
LOWJul 8, 2026NCT07596199Status: NOT_YET_RECRUITING → RECRUITING
LOWJul 8, 2026NCT07596173Status: NOT_YET_RECRUITING → RECRUITING

Frequently asked questions about dTpa

What is the dTpa vaccine?

The dTpa vaccine is a combined vaccine against diphtheria, tetanus, and acellular pertussis. It is being developed by GSK plc (ticker: GSK) and is in Phase 3 clinical development. The vaccine is studied in healthy populations, including pregnant women and adolescents, for protection against these three bacterial infections.

What is the dTpa vaccine used for?

The dTpa vaccine is used for immunization against diphtheria, tetanus, and acellular pertussis. Clinical studies are evaluating its immune response and safety in healthy Japanese pregnant women and in healthy Japanese adolescents aged 11 to under 13 years. It is intended to protect against these three infectious diseases.

Who makes the dTpa vaccine?

GSK plc, which trades under the ticker GSK, is the developer of the dTpa vaccine. The company is running Phase 3 clinical trials of the combined diphtheria, tetanus, and acellular pertussis vaccine, including studies in Japanese pregnant women and Japanese adolescents.

What phase is the dTpa vaccine in?

The dTpa vaccine is in Phase 3 clinical development. It is investigational and has not been approved. Two Phase 3 trials are registered, one active and not recruiting and one completed, with a combined enrollment of 190 participants across both studies.

What clinical trials is the dTpa vaccine in?

The dTpa vaccine is being studied in two Phase 3 trials. NCT07596199 evaluates immune response and safety in healthy Japanese pregnant women and is active but not recruiting. NCT07596173 evaluated immune response and safety in healthy Japanese adolescents aged 11 to under 13 years and is completed. Both trials are in Japan.

Is dTpa the same as the dTpa vaccine?

Yes, dTpa is another name for the dTpa vaccine. The abbreviation stands for diphtheria, tetanus, and acellular pertussis, the three diseases the combined vaccine targets. Searches for dTpa and dTpa vaccine refer to the same GSK Phase 3 product.