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Chlamydia mRNA Vaccine

Phase 1

Chlamydia Trachomatis Immunization | Monoclonal antibody | Infectious Disease |Sanofi|Last Updated: Apr 8, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment1,560

FDA Designations

No designations recorded

Clinical trial landscape

Chlamydia mRNA Vaccine · 1 trial · 1 indication

Phase 1 1
NCT06891417Phase 1/2 Study of Chlamydia Trachomatis mRNA Vaccine in Adults Aged 18 to 29 YearsChlamydia Trachomatis Immunization
RECRUITING1,560 Analytics
PHASE1RECRUITING
Phase 1/2 Study of Chlamydia Trachomatis mRNA Vaccine in Adults Aged 18 to 29 Years
Chlamydia Trachomatis ImmunizationUnlock trial analytics

Study Endpoints

Primary Endpoints

Presence of immediate unsolicited systemic adverse events (AEs)
Within 30 minutes after each vaccine injection

Number of participants with immediate unsolicited systemic adverse events (AEs) reported in the 30 minutes after each vaccine injection.

Presence of solicited injection site and systemic reactions
Up to 7 days after each vaccine injection

Number of participants with solicited injection site and systemic reactions occurring up to 7 days after each vaccine injection.

Presence of unsolicited AEs
Up to 28 days after each vaccine injection.

Participants with unsolicited AEs reported up to 28 days after each vaccine injection.

Presence of medically attended adverse events (MAAEs)
Up to 6 months after last vaccine injection

Number of participants with MAAEs reported after each vaccine injection and up to 6 months after last vaccine injection.

Presence of all serious AEs (SAEs) and all adverse events of special interest (AESIs)
Up to 12 months after last vaccine injections

Number of participants with SAEs and all AESIs reported after each vaccine injection and up to 12 months after last vaccine injection

Presence of related SAEs, and fatal SAEs
Throughout the study, appriximatley 18 months

Number of participants with related SAEs, and fatal SAEs throughout the study

Presence of out-of-range biological test results (Sentinel Cohort and Safety Subset of Main Cohort)
Up to 7 days after each vaccination injections

Number of participants with out-of-range biological test results up to 7 days after each vaccine injection

Secondary Endpoints

Assessment of serum binding antibodies to specific Chlamydia trachomatis antigens and whole bacteria in immunogenicity subset
Before each vaccine injection through 1 month after each vaccine injection
Geometric mean cell-mediated immune response of antigen-specific T helper type 1 (Th1) and T helper type 2 (Th2) cytokine-producing T cells by phenotype
Before each vaccine injection through 1 month after each vaccine injection
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelSEQUENTIAL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Sentinel Cohort A Group 1: Chlamydia trachomatis SeronegativeEXPERIMENTALParticipants will receive three low dose injections of Chlamydia mRNA Vaccine
Sentinel Cohort B Group 2: Chlamydia trachomatis SeronegativeEXPERIMENTALParticipants will receive three medium dose injections of Chlamydia mRNA Vaccine
Sentinel Cohort C Group 3: Chlamydia trachomatis SeronegativeEXPERIMENTALParticipants will receive three high dose injections of Chlamydia mRNA Vaccine
Sentinel Cohort A, B and C Group 4: Chlamydia trachomatis SeronegativePLACEBO_COMPARATORParticipants will receive three injections of Placebo
Sentinel Cohort A Group 5: Chlamydia trachomatis SeropositiveEXPERIMENTALParticipants will receive three low dose injections of Chlamydia mRNA Vaccine
Sentinel Cohort B Group 6: Chlamydia trachomatis SeropositiveEXPERIMENTALParticipants will receive three medium dose injections of Chlamydia mRNA Vaccine
Sentinel Cohort C Group 7: Chlamydia trachomatis SeropositiveEXPERIMENTALParticipants will receive three medium dose injections of Chlamydia mRNA Vaccine
Sentinel Cohort A, B and C Group 8: Chlamydia trachomatis SeropositivePLACEBO_COMPARATORParticipants will receive three injections of Placebo
Main Cohort Group 9: Chlamydia trachomatis SeronegativeEXPERIMENTALParticipants will receive three low dose injections of Chlamydia mRNA Vaccine
Main Cohort Group 10: Chlamydia trachomatis SeronegativeEXPERIMENTALParticipants will receive three medium dose injections of Chlamydia mRNA Vaccine
Main Cohort Group 11: Chlamydia trachomatis SeronegativeEXPERIMENTALParticipants will receive three high dose injections of Chlamydia mRNA Vaccine
Main Cohort Group 12: Chlamydia trachomatis SeronegativePLACEBO_COMPARATORParticipants will receive three injections of Placebo
Main Cohort Group 13: Chlamydia trachomatis SeropositiveEXPERIMENTALParticipants will receive three low dose injections of Chlamydia mRNA Vaccine
Main Cohort Group 14: Chlamydia trachomatis SeropositiveEXPERIMENTALParticipants will receive three medium dose injections of Chlamydia mRNA Vaccine
Main Cohort Group 15: Chlamydia trachomatis SeropositiveEXPERIMENTALParticipants will receive three high dose injections of Chlamydia mRNA Vaccine
Main Cohort Group 16: Chlamydia trachomatis SeropositivePLACEBO_COMPARATORParticipants will receive three injections of Placebo

Interventions

NameTypeDescription
Chlamydia mRNA VaccineBIOLOGICALPharmaceutical Form: Suspension for injection Route of Administration: Intramuscular injection
PlaceboOTHERPharmaceutical Form: Solution for injection Route of Administration: Intramuscular injection
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Eligibility Criteria

Age Range18 Years to 29 Years
SexALL
Healthy VolunteersYes
Study Sites7

Inclusion Criteria: * Aged 18 to 29 years on the day of inclusion * New sex partner within the past 6 months, or more than one current sex partner, or partner with known previous or coexisting sexually transmitted infection (STI), or inconsistent condom use * A female participant is eligible to par...

Countries:Australia
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Frequently asked questions about Chlamydia mRNA Vaccine

What is Chlamydia mRNA Vaccine used for?

Chlamydia mRNA Vaccine is an investigational vaccine being developed for immunization against Chlamydia trachomatis infection. It is currently in Phase 1 clinical development, studied in healthy adults aged 18 to 29 years. The vaccine is designed to prevent chlamydia, a common sexually transmitted infection.

Who makes Chlamydia mRNA Vaccine?

Chlamydia mRNA Vaccine is being developed by Sanofi, a global biopharmaceutical company listed on the stock exchange under the ticker SNY. Sanofi is conducting clinical trials to evaluate the safety and immunogenicity of this investigational vaccine for Chlamydia trachomatis immunization.

What phase is Chlamydia mRNA Vaccine in?

Chlamydia mRNA Vaccine is currently in Phase 1 clinical development. It is an investigational vaccine, meaning it has not been approved by regulatory authorities and is still being studied in clinical trials. The ongoing Phase 1/2 study is recruiting participants to evaluate the vaccine's safety and immune response.

What clinical trials is Chlamydia mRNA Vaccine in?

Chlamydia mRNA Vaccine is being evaluated in a Phase 1/2 clinical trial with the identifier NCT06891417. This randomized, double-blind, placebo-controlled study is recruiting 1,560 healthy adults aged 18 to 29 years in Australia. The trial is currently active and recruiting participants.

Is Chlamydia mRNA Vaccine a monoclonal antibody?

No, Chlamydia mRNA Vaccine is not a monoclonal antibody. Despite its modality being listed as such in some databases, the drug name indicates it is an mRNA-based vaccine. It is designed to elicit an immune response against Chlamydia trachomatis, rather than acting as a therapeutic antibody.