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VISTA: Vaccinator-Initiated Screening and TAilored Counseling for Reducing Vaccine Hesitancy

VISTA: Vaccinator-Initiated Screening and TAilored Counseling for Reducing Vaccine Hesitancy

Status
Completed
Phases
NA
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04421586
Enrollment
60
Registered
2020-06-09
Start date
2020-09-02
Completion date
2021-05-24
Last updated
2024-01-05

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Vaccination Uptake

Keywords

vaccine hesitancy

Brief summary

The purpose of this study is to understand why parents do or do not vaccinate their children and explore what information parents need to vaccinate their children. The study will test whether information about vaccinations provided during pregnancy by a health provider (VISTA intervention) may improve the possibility that a child is vaccinated on time.

Detailed description

The study will be implemented in 10 health facility catchment areas in Mtwara region, Tanzania. The study sites will be non-randomly assigned to receive VISTA or usual care. Only core messages were developed and evaluated in this study. Tailored messages will be developed and evaluated in a follow-up study.

Interventions

BEHAVIORALVISTA

VISTA will be an educational intervention.

Sponsors

Duke University
Lead SponsorOTHER

Study design

Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
HEALTH_SERVICES_RESEARCH
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
15 Years to No maximum
Healthy volunteers
Yes

Inclusion criteria

Study outcomes will be measured for health providers implementing the intervention and pregnant women receiving the intervention. Up to 10 health workers (including community health workers (CHW) from each of the intervention sites will participate in the study. To participate in the study, Health workers must be: * 18 years of age or older * Work in one of the study intervention sites Women must be: * In the third trimester of pregnancy * Residing in a study site (intervention or control) * At least 15 years of age * Planning to reside in the study site for the duration of their participation in the study (until approximately 6 months after delivery to enable follow up). * Have at least 1 concern about childhood vaccines

Exclusion criteria

There are no

Design outcomes

Primary

MeasureTime frame
Percentage of Women With Reduced Number of Concerns Immediately Post-counseling in the Intervention ArmPost-counseling (Baseline visit)

Secondary

MeasureTime frameDescription
Percentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmFollow-up (up to 6 months post-birth; up to 9 months post-baseline)Includes early doses up to 1 week prior to due date. In the event of twins, information for only 1 child per mother was included in the determination of outcomes.
Median Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmFollow-up (up to 6 months post-birth; up to 9 months post-baseline)
Percentage of Checklist Items Completed During Counseling in VISTA Intervention ArmBaseline
Mean Number of Minutes Spent Delivering Counseling Per Woman in VISTA Intervention ArmBaseline
Number of Women in the VISTA Intervention Arm Who Say That the Information Provided by the Community Health Worker (CHW) is HelpfulBaseline
Number of Women in the VISTA Intervention Arm Who Say That the Information Provided by the Community Health Worker (CHW) Reduced Their Concerns About VaccinationsBaseline
Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Helped Them Understand Why Children Needed VaccinesBaseline
Percentage of Women With Reduced Number of Concerns in Intervention Versus Control Arms at Follow up.Follow-up (up to 6 months post-birth; up to 9 months post-baseline)
Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Was RespectfulBaseline
Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Explained Things in Terms They Could UnderstandBaseline
Number of Women in the VISTA Intervention Arm Who Were Satisfied With Their Conversation With the Community Health Worker (CHW)Baseline
Number of Women in the VISTA Intervention Arm Who Say They Are Comfortable Vaccinating Their ChildBaseline
Number of Women in the VISTA Intervention Arm Who Say They Will Speak With the CHW AgainBaseline
Number of Women in the VISTA Intervention Arm Who Say They Would Refer the CHW to Their Friends and FamilyBaseline
Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Answered Most of Their QuestionsBaseline

Countries

Tanzania

Participant flow

Recruitment details

Participants recruited from medical clinics and surrounding communities in rural areas.

Participants by arm

ArmCount
Pregnant Women Receiving VISTA Counseling
Up to 30 pregnant women are screened and counseled for vaccine concerns using VISTA (Vaccinator-Initiated Screening and TAilored Counseling for Reducing Vaccine Hesitancy) VISTA: VISTA will be an educational intervention.
29
Pregnant Women Receiving Usual Care
Up to 30 pregnant women receiving usual care
30
Total59

Withdrawals & dropouts

PeriodReasonFG000FG001
Overall StudyDeath01
Overall StudyInfant death (no follow up data or vaccination outcomes)23
Overall StudyLost to Follow-up22
Overall StudyWithdrawn by PI10

Baseline characteristics

CharacteristicPregnant Women Receiving VISTA CounselingTotalPregnant Women Receiving Usual Care
Age, Continuous31.28 years
STANDARD_DEVIATION 7.04
29.66 years
STANDARD_DEVIATION 7.85
28.10 years
STANDARD_DEVIATION 8.38
Ethnicity (NIH/OMB)
Hispanic or Latino
0 Participants0 Participants0 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
29 Participants59 Participants30 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Asian
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Black or African American
29 Participants59 Participants30 Participants
Race (NIH/OMB)
More than one race
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants
Race (NIH/OMB)
White
0 Participants0 Participants0 Participants
Region of Enrollment
Tanzania
29 Participants59 Participants30 Participants
Sex: Female, Male
Female
29 Participants59 Participants30 Participants
Sex: Female, Male
Male
0 Participants0 Participants0 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
0 / 301 / 30
other
Total, other adverse events
0 / 300 / 30
serious
Total, serious adverse events
0 / 300 / 30

Outcome results

Primary

Percentage of Women With Reduced Number of Concerns Immediately Post-counseling in the Intervention Arm

Time frame: Post-counseling (Baseline visit)

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (NUMBER)
Pregnant Women Receiving VISTA CounselingPercentage of Women With Reduced Number of Concerns Immediately Post-counseling in the Intervention Arm51.72 percentage of women
Secondary

Mean Number of Minutes Spent Delivering Counseling Per Woman in VISTA Intervention Arm

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (MEAN)
Pregnant Women Receiving VISTA CounselingMean Number of Minutes Spent Delivering Counseling Per Woman in VISTA Intervention Arm15.86 minutes
Secondary

Median Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control Arm

Time frame: Follow-up (up to 6 months post-birth; up to 9 months post-baseline)

Population: Data not collected on 13 participants.

ArmMeasureGroupValue (MEDIAN)
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmBCG6.5 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 06 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 15 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 28 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 319 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio IPV15 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmDTP 13 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmDTP 29.5 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmDTP 314.5 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPCV 13 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPCV 29.5 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPCV 314.5 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmRTR 15 days
Pregnant Women Receiving VISTA CounselingMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmRTR 220.5 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPCV 213 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmBCG12 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmDTP 212 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 08.5 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmRTR 15 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 13 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmDTP 317 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 213 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPCV 317 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio 314 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPCV 14 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmPolio IPV19.5 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmRTR 212 days
Pregnant Women Receiving Usual CareMedian Number of Days Children Remain Unvaccinated for Each Vaccine in Intervention Versus Control ArmDTP 13 days
Secondary

Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Answered Most of Their Questions

Time frame: Baseline

Population: Data not collected.

Secondary

Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Explained Things in Terms They Could Understand

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Explained Things in Terms They Could Understand27 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Helped Them Understand Why Children Needed Vaccines

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Helped Them Understand Why Children Needed Vaccines26 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Was Respectful

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say That the Community Health Worker (CHW) Was Respectful28 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Say That the Information Provided by the Community Health Worker (CHW) is Helpful

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say That the Information Provided by the Community Health Worker (CHW) is Helpful28 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Say That the Information Provided by the Community Health Worker (CHW) Reduced Their Concerns About Vaccinations

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say That the Information Provided by the Community Health Worker (CHW) Reduced Their Concerns About Vaccinations24 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Say They Are Comfortable Vaccinating Their Child

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say They Are Comfortable Vaccinating Their Child29 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Say They Will Speak With the CHW Again

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say They Will Speak With the CHW Again28 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Say They Would Refer the CHW to Their Friends and Family

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Say They Would Refer the CHW to Their Friends and Family28 Participants
Secondary

Number of Women in the VISTA Intervention Arm Who Were Satisfied With Their Conversation With the Community Health Worker (CHW)

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pregnant Women Receiving VISTA CounselingNumber of Women in the VISTA Intervention Arm Who Were Satisfied With Their Conversation With the Community Health Worker (CHW)28 Participants
Secondary

Percentage of Checklist Items Completed During Counseling in VISTA Intervention Arm

Time frame: Baseline

Population: Outcome measure only applies to the VISTA arm.

ArmMeasureValue (MEAN)
Pregnant Women Receiving VISTA CounselingPercentage of Checklist Items Completed During Counseling in VISTA Intervention Arm90.17 percentage of items
Secondary

Percentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control Arm

Includes early doses up to 1 week prior to due date. In the event of twins, information for only 1 child per mother was included in the determination of outcomes.

Time frame: Follow-up (up to 6 months post-birth; up to 9 months post-baseline)

Population: Data not collected on 13 participants.

ArmMeasureGroupValue (NUMBER)
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 164.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmDTP 384.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 3 (OPV3/IPV)68.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPCV 192.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 088.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPCV 288.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmDTP 1100.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPCV 384.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 248.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmRTR 176.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmDTP 296.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmRTR 272.00 percentage of children
Pregnant Women Receiving VISTA CounselingPercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmBCG96.00 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmRTR 269.57 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmBCG86.96 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 082.61 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 173.91 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 256.52 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPolio 3 (OPV3/IPV)60.87 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmDTP 195.65 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmDTP 286.96 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmDTP 369.57 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPCV 186.96 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPCV 278.26 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmPCV 360.87 percentage of children
Pregnant Women Receiving Usual CarePercentage of Children by Vaccine Who Received the Vaccine Within 4-week Window of Due Date in Intervention Versus Control ArmRTR 178.00 percentage of children
Secondary

Percentage of Women With Reduced Number of Concerns in Intervention Versus Control Arms at Follow up.

Time frame: Follow-up (up to 6 months post-birth; up to 9 months post-baseline)

Population: Data not collected on 6 participants in each group.

ArmMeasureValue (NUMBER)
Pregnant Women Receiving VISTA CounselingPercentage of Women With Reduced Number of Concerns in Intervention Versus Control Arms at Follow up.48.0 percentage of women
Pregnant Women Receiving Usual CarePercentage of Women With Reduced Number of Concerns in Intervention Versus Control Arms at Follow up.62.5 percentage of women

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026