Access to ImmunizationCall 4 LifeNCT07154836
Call for Life: Exploring mHealth Solutions for Enhancing Childhood Vaccinations Among Displaced Children in Conflict-affected Settings of Nigeria
A study testing Telephone calls in people with Access to Immunization, run by University of Cambridge at 1 site in Nigeria.
Trial summary
This study evaluates the feasibility and preliminary impact of Call for Life, an mHealth platform aimed at increasing childhood vaccination coverage among internally displaced persons in Borno State, Nigeria. Read more about this study
- Who is it for?
- Ages 23 to 23 monthsHealthy volunteers can take part
- Conditions the study is for
- Access to Immunization
- What is being tested?
- Telephone calls
- Type of treatment
- Vaccines
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 366 participants
- Where
- 1 siteNigeria
- Study dates
- 24 Jun 2025to 30 Dec 2025
- 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 23 to 23 months
- All sexes
- Healthy volunteers accepted
- Child
Who may be able to join
- • Caregivers (male/female) of children from 0-23 months of age or pregnant women in third trimester
- Caregivers above the age of 18 years of age
- Caregivers who consent to participate in the study.
- Resident in the IDP camp for at least one year
Who cannot join
- • Pregnant women in third trimester in first pregnancy (primigravida)
- Caregivers that are temporary residents of the IDP camps (IDPs on transit or visitors)
- Caregivers without the mental capacity to comprehend the questions asked.
- Inability to use or interact with a mobile phone ( e.g. those with hearing defects or poor vision)
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
About this study
This study evaluates the feasibility and preliminary impact of Call for Life, an mHealth platform aimed at increasing childhood vaccination coverage among internally displaced persons in Borno State, Nigeria. The platform uses an interactive voice response (IVR) system to deliver automated vaccination reminders, follow up on reported side effects, and provide health messages in English and local languages. A mixed-methods design is used to assess feasibility, interaction rates, and early effects on vaccine uptake. Findings will inform policymakers and humanitarian actors on the potential of mobile technology to strengthen immunization delivery in conflict-affected, resource-limited settings.
- Conditions
- Access to Immunization
- Being tested
- Telephone calls
- Keywords
- Immunization, mhealth
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Telephone callsOther
Also called Call4life
Regular telephone reminders and health information will be sent to help mothers or caregivers of children 0-23 months to remind them to go vaccine their children
| Study group | Role | What they receive |
|---|---|---|
| Call4life | Experimental | Care givers will be reminded using telephone calls to go vaccine their children Receives: Other: Telephone calls |
What is being measured
The primary outcome is the main question the study is designed to answer.
Number of zero-dose children aged 0-23 months vaccinated and registered in an immunization registry at the health facility
Number of zero-dose children aged 0-23 months vaccinated and registered in an immunization registry at the health facility. The immunization registry which will be used by the health facility to follow up with parents for the vaccination schedules of the children
Measured: 6 months
Number of care givers to children aged 0-23 months who receive reminder calls from the call for life platform and take their children to the health facility for immunization
Number of care givers to children aged 0-23 months who receive reminder calls from the call for life platform and take their children to the health facility for immunization and registration into an immunization registry
Measured: 6 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 Sep 2025
- Study start24 Jun 2025
- Primary completion24 Nov 2025 (estimated)
- Study completion30 Dec 2025 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Access to ImmunizationStudies of the same condition, open and under way.
- 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
- Health services research
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 366 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University of Cambridge
- Sponsor type
- University, hospital or other
- Collaborators
- University of Maiduguri, Infectious Disease Institute at Makerere University
- Responsible party
- Principal investigator, Lundi-Anne Omam Ngo Bibaa, University of Cambridge
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07154836
- Sponsor's protocol ID
- Call-4-Life
- Other IDs
- Not application
- Acronym
- Call 4 Life
- Status last verified
- Aug 2025
- First submitted
- 15 Aug 2025
- Last updated
- 4 Sep 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: IDP will be shared with researchers involved in the study.
Study at a glance
From the registry record, last updated by the sponsor on 4 Sep 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Call for Life: Exploring mHealth Solutions for Enhancing Childhood Vaccinations Among Displaced Children in Conflict-affected Settings of Nigeria
- ClinicalTrials.gov ID
- NCT07154836
- Acronym / sponsor ID
- Call 4 Life / Call-4-Life
- Conditions
- Access to Immunization
- Keywords
- Immunization, mhealth
- Study type
- Interventional
- Recruitment status
- Enrolling by invitation
- Enrolment
- 366 participants (estimated)
- Lead sponsor
- University of CambridgeUniversity, hospital or other
- Collaborators
- University of Maiduguri, Infectious Disease Institute at Makerere University
- Study start
- 24 Jun 2025 (actual)
- Primary completion
- 24 Nov 2025 (estimated)
- Study completion
- 30 Dec 2025 (estimated)
- First posted
- 4 Sep 2025 (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.
This study evaluates the feasibility and preliminary impact of Call for Life, an mHealth platform aimed at increasing childhood vaccination coverage among internally displaced persons in Borno State, Nigeria. The platform uses an interactive voice response (IVR) system to deliver automated vaccination reminders, follow up on reported side effects, and provide health messages in English and local languages. A mixed-methods design is used to assess feasibility, interaction rates, and early effects on vaccine uptake. Findings will inform policymakers and humanitarian actors on the potential of mobile technology to strengthen immunization delivery in conflict-affected, resource-limited settings.
Study design
- Primary purpose
- Health services research
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Call4life | Experimental | Other: Telephone callsCare givers will be reminded using telephone calls to go vaccine their children |
Who may qualify
- Ages
- 23 to 23 months
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child
Key inclusion criteria (4 listed)
- • Caregivers (male/female) of children from 0-23 months of age or pregnant women in third trimester
Key exclusion criteria (4 listed)
- • Pregnant women in third trimester in first pregnancy (primigravida)
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 |
|---|---|---|
| Telephone callsAlso: Call4lifeRegular telephone reminders and health information will be sent to help mothers or caregivers of children 0-23 months to remind them to go vaccine their children | Other | Call4life |
Primary outcome
Number of zero-dose children aged 0-23 months vaccinated and registered in an immunization registry at the health facility
Time frame: 6 months
Number of zero-dose children aged 0-23 months vaccinated and registered in an immunization registry at the health facility. The immunization registry which will be used by the health facility to follow up with parents for the vaccination schedules of the children
Number of care givers to children aged 0-23 months who receive reminder calls from the call for life platform and take their children to the health facility for immunization
Time frame: 6 months
Number of care givers to children aged 0-23 months who receive reminder calls from the call for life platform and take their children to the health facility for immunization and registration into an immunization registry
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 4 Sep 2025.
- Individual participant dataSharing planned: Yes. IDP will be shared with researchers involved in the study.
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.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Telephone calls in people with Access to Immunization, run by University of Cambridge at 1 site in Nigeria.
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 4 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: enrolling by invitation, as of the sponsor's last update on 4 Sep 2025. 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 Nigeria. 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?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Number of zero-dose children aged 0-23 months vaccinated and registered in an immunization registry at the health facility (time frame: 6 months). The study lists 2 primary outcomes in all. 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 4 Sep 2025; AzTrials last refreshed its copy on 7 Nov 2026.