CholeraCoPNCT06455852
Vaccine- and Infection-derived Correlates of Protection for Cholera
A study testing oral cholera vaccine or typhoid conjugate vaccine in people with Cholera, run by Massachusetts General Hospital at 1 site in Bangladesh.
Trial summary
Background: Vibrio cholerae causes millions of cholera cases and thousands of deaths annually. Vaccines are in short supply. There is no agreement on how to introduce new vaccines or evaluate their effectiveness, and the lack of 'correlates of protection' (CoPs) against cholera is a major obstacle to vaccine… Read more about this study
- Who is it for?
- Ages 2 to 80 yearsHealthy volunteers can take part
- Conditions the study is for
- Cholera
- What is being tested?
- oral cholera vaccine or typhoid conjugate vaccine
- Type of treatment
- Vaccines, Pill or oral medicine
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 1,221 participants
- Where
- 1 siteBangladesh
- Study dates
- 2 Mar 2025to 1 May 2029
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 2 to 80 years
- All sexes
- Healthy volunteers accepted
- Child, Adult, Older adult
Who may be able to join
- Ages 2 - 80 years.
- Informed consent from study participants and guardian in case of children (2-17 years) and assent from children aged 11-17 years.
- Intention to participate in the study for a 2-year period.
- No major co-morbid conditions, per the supervising clinician investigator, including underlying immunodeficiency, diabetes, liver diseases, renal disease, cardiac disease, and/or active malignancy.
Who cannot join
- Suffering from diarrhoea or abdominal pain or vomiting in the past 24 hours or diarrhoea lasting for more than 2 weeks in the past 6 months.
- History of taking another oral cholera vaccine.
- History of taking any other live or killed enteric vaccine in the last 8 weeks.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Bangladesh1 site, 1 recruiting
- Recruiting
Icddr,B
Dhaka
Firduasi Qadri, Ph.D., 88-01711595367, fqadri@icddrb.org
Firdausi Qadri, Ph.D.
About this study
Background: Vibrio cholerae causes millions of cholera cases and thousands of deaths annually. Vaccines are in short supply. There is no agreement on how to introduce new vaccines or evaluate their effectiveness, and the lack of 'correlates of protection' (CoPs) against cholera is a major obstacle to vaccine development. CoPs are markers of effective immune response to vaccination. While other infectious diseases have well established CoPs, none are widely accepted for cholera.
Relevance: Lack of accepted CoPs impedes development of cholera vaccines, limiting progress toward improved vaccines, slowing the licensure of new vaccines, and contributing to the current vaccine shortage; an immediate obstacle to achieving reductions in cholera-related illness and deaths. The identification of new CoPs will speed the development of improved cholera vaccines and provide a pathway to their licensure and use.
Read more
Hypothesis: The investigators hypothesize that some individuals who receive inactivated oral cholera vaccine (OCV) will develop antibody responses which predict protection against V. cholerae infection and that specific immune responses distinguish individuals who are protected against cholera by prior natural infection from those who are protected from OCVs.
Objectives: The investigators will administer an OCV or typhoid vaccine (TCV) control and monitor antibody responses to identify better CoPs for cholera following both vaccination and natural infection.
Methods: The investigators will randomize 1219 participants; 554 participants will receive an inactivated bivalent OCV, 665 participants will receive a TCV control. The investigators will collect 12 blood samples over two-years following vaccination to measure antibodies against V. cholerae and to monitor for re-infection.
Outcome measures/variables: The endpoint of interest is V. cholerae infection after vaccination. The investigators define infection as positive culture or PCR for V. cholerae or seroconversion events observed over the 2-year follow up period.
- Conditions
- Cholera
- Being tested
- oral cholera vaccine or typhoid conjugate vaccine
- Medical subject headings
- Cholera
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
oral cholera vaccine or typhoid conjugate vaccineBiological
One group of participants will receive a 2 dose oral cholera vaccine, the other set will receive a typhoid conjugate vaccine
| Study group | Role | What they receive |
|---|---|---|
| Cholera Vaccine Arm | Experimental | The investigators will measure mucosal, memory B cell and circulating antibody responses to V. cholerae in the participants using an established immunoprofiling approach. The investigators will then identify individuals who develop V. cholerae infection over a two-year period, including those with mild and asymptomatic infection. They will use a systems-serology approach to identify CoPs in the OCV (bWC) cohort and non-OCV vaccinated control (TCV) cohort. Our approach will include cross-validation and adjustments for age, sex, and baseline immunity, to identify vaccine-induced CoPs. We will also compare the performance of these CoPs with the traditional vibriocidal titer. Receives: Biological: oral cholera vaccine or typhoid conjugate vaccine |
| Typhoid Vaccine Arm | Other | The investigators will compare individual CoPs and immunologic signatures in the OCV and non-cholera vaccinated (TCV) control arms which are correlated with protection. This will identify individual CoPs and immunologic signatures which distinguish protective immunity derived from natural infection with V. cholerae from immunity derived from inactivated OCV response. Receives: Biological: oral cholera vaccine or typhoid conjugate vaccine |
What is being measured
The primary outcome is the main question the study is designed to answer.
Vibrio cholerae infection
Serologic, PCR or culture evidence of infection
Measured: 2 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Jun 2024
- Study start2 Mar 2025
- Primary completion31 Dec 2028 (estimated)
- Study completion1 May 2029 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for CholeraStudies of the same condition, open and under way.
- More trials run by Massachusetts General HospitalThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 1,221 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Massachusetts General Hospital
- Sponsor type
- University, hospital or other
- Collaborators
- International Centre for Diarrhoeal Disease Research, Bangladesh
- Responsible party
- Principal investigator, Jason B. Harris, MD, Massachusetts General Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06455852
- Sponsor's protocol ID
- PR-24048
- Acronym
- CoP
- Status last verified
- Apr 2026
- First submitted
- 7 Jun 2024
- Last updated
- 8 Apr 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: A data sharing plan will be developed in accordance with funder regulations and institutional policies. Deidentified data will be shared upon publication of study results.
Study at a glance
From the registry record, last updated by the sponsor on 8 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Vaccine- and Infection-derived Correlates of Protection for Cholera
- ClinicalTrials.gov ID
- NCT06455852
- Acronym / sponsor ID
- CoP / PR-24048
- Conditions
- Cholera
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 1,221 participants (estimated)
- Lead sponsor
- Massachusetts General HospitalUniversity, hospital or other
- Collaborators
- International Centre for Diarrhoeal Disease Research, Bangladesh
- Study start
- 2 Mar 2025 (actual)
- Primary completion
- 31 Dec 2028 (estimated)
- Study completion
- 1 May 2029 (estimated)
- First posted
- 12 Jun 2024 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Background: Vibrio cholerae causes millions of cholera cases and thousands of deaths annually. Vaccines are in short supply. There is no agreement on how to introduce new vaccines or evaluate their effectiveness, and the lack of 'correlates of protection' (CoPs) against cholera is a major obstacle to vaccine development. CoPs are markers of effective immune response to vaccination. While other infectious diseases have well established CoPs, none are widely accepted for cholera.
Relevance: Lack of accepted CoPs impedes development of cholera vaccines, limiting progress toward improved vaccines, slowing the licensure of new vaccines, and contributing to the current vaccine shortage; an immediate obstacle to achieving reductions in cholera-related illness and deaths. The identification of new CoPs will speed the development of improved cholera vaccines and provide a pathway to their licensure and use.
Hypothesis: The investigators hypothesize that some individuals who receive inactivated oral cholera vaccine (OCV) will develop antibody responses which predict protection against V. cholerae infection and that specific immune responses distinguish individuals who are protected against cholera by prior natural infection from those who are protected from OCVs.
Objectives: The investigators will administer an OCV or typhoid vaccine (TCV) control and monitor antibody responses to identify better CoPs for cholera following both vaccination and natural infection.
Methods: The investigators will randomize 1219 participants; 554 participants will receive an inactivated bivalent OCV, 665 participants will receive a TCV control. The investigators will collect 12 blood samples over two-years following vaccination to measure antibodies against V. cholerae and to monitor for re-infection.
Outcome measures/variables: The endpoint of interest is V. cholerae infection after vaccination. The investigators define infection as positive culture or PCR for V. cholerae or seroconversion events observed over the 2-year follow up period.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Cholera Vaccine Arm | Experimental | Biological: oral cholera vaccine or typhoid conjugate vaccineThe investigators will measure mucosal, memory B cell and circulating antibody responses to V. cholerae in the participants using an established immunoprofiling approach. The investigators will then identify individuals who develop V. cholerae infection over a two-year period, including those with mild and asymptomatic infection. They will use a systems-serology approach to identify CoPs in the OCV (bWC) cohort and non-OCV vaccinated control (TCV) cohort. Our approach will include cross-validation and adjustments for age, sex, and baseline immunity, to identify vaccine-induced CoPs. We will also compare the performance of these CoPs with the traditional vibriocidal titer. |
| Typhoid Vaccine Arm | Other | Biological: oral cholera vaccine or typhoid conjugate vaccineThe investigators will compare individual CoPs and immunologic signatures in the OCV and non-cholera vaccinated (TCV) control arms which are correlated with protection. This will identify individual CoPs and immunologic signatures which distinguish protective immunity derived from natural infection with V. cholerae from immunity derived from inactivated OCV response. |
Who may qualify
- Ages
- 2 to 80 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (4 listed)
- Ages 2 - 80 years.
- Informed consent from study participants and guardian in case of children (2-17 years) and assent from children aged 11-17 years.
- Intention to participate in the study for a 2-year period.
- No major co-morbid conditions, per the supervising clinician investigator, including underlying immunodeficiency, diabetes, liver diseases, renal disease, cardiac disease, and/or active malignancy.
Key exclusion criteria (3 listed)
- Suffering from diarrhoea or abdominal pain or vomiting in the past 24 hours or diarrhoea lasting for more than 2 weeks in the past 6 months.
- History of taking another oral cholera vaccine.
- History of taking any other live or killed enteric vaccine in the last 8 weeks.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| oral cholera vaccine or typhoid conjugate vaccineOne group of participants will receive a 2 dose oral cholera vaccine, the other set will receive a typhoid conjugate vaccine | Biological | Cholera Vaccine Arm, Typhoid Vaccine Arm |
Primary outcome
Vibrio cholerae infection
Time frame: 2 years
Serologic, PCR or culture evidence of infection
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 Apr 2026.
- Individual participant dataSharing planned: Yes. A data sharing plan will be developed in accordance with funder regulations and institutional policies. Deidentified data will be shared upon publication of study results.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing oral cholera vaccine or typhoid conjugate vaccine in people with Cholera, run by Massachusetts General Hospital at 1 site in Bangladesh.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 8 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Bangladesh. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Each site lists its own contact: choose the nearest one under Trial locations. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Vibrio cholerae infection (time frame: 2 years). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Apr 2026; AzTrials last refreshed its copy on 8 Nov 2026.