Vaccine RefusalNCT05749419
Vaccinations and People With Disabilities
An observational study of Vaccine Refusal and Compliance, Patient, run by Hadassah Medical Organization at 1 site in Israel.
Trial summary
The goal of this observational study is to learn about vaccinations hesitancy, delay or avoidance in children with chronic diseases, congenital anomalies or disabilities. The main questions it aims to answer are: Attitudes of caregivers towards vaccinating their children, obstacles that postpone vaccinations, and the… Read more about this study
- Who is it for?
- Any ageHealthy volunteers can take part
- Conditions the study is for
- Vaccine Refusal, Compliance, Patient, Disability, Intellectual
- How many people
- 1,000 participants
- Where
- 1 siteIsrael
- Study dates
- 1 Jul 2023to Jan 2026
- Phase
- Observational
- Are there results?
- None posted in the registry
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 Any age
- All sexes
- Healthy volunteers accepted
- Child, Adult, Older adult
Study population: Children with disabilities, chronic conditions and congenital anomalies. The parents will fiil out the questionnaires and participate in focus groups.
Who may be able to join
- Diagnosed children with disabilities, chronic diseases or congenital anomalies
Who cannot join
- Undiagnosed children
- Inadequate filled out questionnaires
Trial locations and contacts
1 site in 1 country.
Israel1 site, 1 recruiting
- Recruiting
Hadassah medical center
Jerusalem, 92140
Ariel Tenenbaum, 0508573725, tene@hadassah.org.il
About this study
Official title: Questionnaires and Focus Groups Based Quantitative & Qualitative Study of Vaccine Hesitancy and Confidence Among At-risk and Marginalized Populations: Persons With Special Needs, Intellectual Disabilities and Congenital Anomalies
The goal of this observational study is to learn about vaccinations hesitancy, delay or avoidance in children with chronic diseases, congenital anomalies or disabilities. The main questions it aims to answer are:
- Attitudes of caregivers towards vaccinating their children, obstacles that postpone vaccinations, and the status of vaccinations of these children.
Participants will fill out questionnaires and some will be included in focused groups for the qualitative part of the study.
Researchers will compare the vaccinations status of the research group to their siblings' status as well as the published national records of vaccination compliance.
Read the detailed description
Global vaccines programs prevent infectious diseases, congenital anomalies and cancer [1,2]. Full and partial avoidance of vaccines, or postponing vaccines, may lead to morbidity, disability and mortality. This is particularly significant among children and adults with special needs, intellectual and developmental disabilities, and congenital anomalies, which are at-risk groups, together representing over 15% of the general population [3,4]. Studies have shown that this population is particularly vulnerable when it comes to infectious diseases, hospitalizations, sexually transmitted diseases, abuse and neglect [5,6,7]. Furthermore, this is a marginalized population, with (in average) a lower socioeconomic status and at a lower level of education of themselves and their caregivers [8]. The reasons for hesitance, avoidance or selectivity of vaccines by the caregivers are not comprehensively characterized. Therefore, the investigators outline our thoughts and Insights from our ongoing work, for over two decades, with this population. In the investigators experience, when doctors and nurses ask the patients and their caregivers what are the reasons for less-then-optimal vaccination state, there are several explanations: concurrent illnesses that made them postpone vaccinations, access challenges, being preoccupied with many other health tasks, and paradoxically the fear that the child is too fragile for receiving the vaccine or that the vaccine itself will do harm. Also, some may be wrongly advised about contraindications that are misinterpreted. It is surprising that the infestigators hear from caregivers about the fear from the vaccines, and not about the fear from the diseases. Another important issue is the unfortunate vulnerability of this population to STD's, which the investigators repeatedly hear from caregivers that this is a non-issue for them, which is clearly a dangerous misconception [9].
Therefore, healthcare professionals are missing valuable information about possible risks and intervention opportunities among an at-risk population.
Objectives:
- The investigators will systematically map the reasons for the delay and/or avoidance, and/or hesitance to vaccinate by conducting a large-scale evaluation of current and planned immunizations among persons of all ages who have special needs, intellectual and developmental disabilities and congenital anomalies (study group). The investigatorswill use a comprehensive questionnaire to collect this information, as well as focused discussion groups for in-depth qualitative investigations. The investigators will compare the data with their sibling's vaccination status and with recruits from the general population (control group).
According to the concept "Do not talk about us without us", The investigators will include persons with special needs and disabilities in the study and make all efforts to hear directly from them in focus groups or individually about their approach to vaccinations, including hesitancies and misconceptions about the procedure.
Hypotheses:
- There is a higher prevalence of vaccine avoidance and delay among the study population.
- The reasons for avoidance and/or delay are:
- Fear of harm - The study population are perceived more fragile, hence more likely to adversely react to vaccines.
- Misconceptions about their vulnerability to STD's, and false beliefs about neurodevelopmental effects of the vaccines themselves.
This is a descriptive qualitative and quantitative study. The Quantitative part consists of comprehensive questionnaires that The investigators will design for the study. The questionnaire will have five sections: 1. Sociodemographic data. 2. Current vaccination status. 3. Delay/hesitancy/avoidance - past present and future plans. 4. Reasons for delay/hesitancy/avoidance if exist. 5. Statements regarding vaccines benefits, safety, known side effects, and misconceptions, and the participants' level of agreement with these statements. All questionnaires will be filled out anonymously after consent to participate.
For the focused groups The investigators will recruit parents and other caregivers as well as persons with disabilities. The investigators will analyze these opened and free discussions, with limited opening remarks and follow up questions for clarification, in a qualitative manner and all themes, dilemmas and experiences will be presented accordingly.
It is based on questionnaires and focus groups studies, with control groups. The investigators will conduct the research in the Hadassah- Hebrew university medical center, in collaboration with associations and institutions that provide healthcare and support for the studied population and their families.
Since The investigators have ongoing collaborations with other academic and clinical institutions in other countries, it is possible for us to explore with them a fruitful collaboration in this research, and developing it to a multicenter study.
The investigators hopefully plan to recruit a total of one thousand participants.
The study population is our patients and their families that arrive for evaluations and treatments. The investigators plan to recruit more participants with the collaboration other associations and institutions. The population is consisted of persons with a variety of disabilities, namely intellectual and developmental disability, Down syndrome, congenital syndromes and genetic disorders.
The investigators will try to include as many persons as possible, excluding those who are reluctant to participate or did not provide minimal information in the questionnaires.
As part of the study procedure and presentation of the results, The investigators will aim to conceptualize tailored programs to increase vaccination confidence and adherence, and propose a follow-up interventional study.
- Conditions
- Vaccine Refusal, Compliance, Patient, Disability, Intellectual, Congenital Disorders, Pediatric Disorder
- Medical subject headings
- Vaccination Refusal, Patient Compliance, Intellectual Disability, Congenital, Hereditary, and Neonatal Diseases and Abnormalities
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| study group and control group | Study group - children with chronic diseases, disabilities, or congenital anomalies. Control group - their siblings. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Percentages of children in the study group who are not vaccinated, partially vaccinated, or vaccinated late, in comparison with the percentages in the control group.
Percecntages as described above as well as description of reasons for vaccination avoidance, delay and hesitancy, obstacles in the way to vaccinate, approach to vaccines as detaled in the questionnaires.
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 posted1 Mar 2023
- Study start1 Jul 2023
- Primary completionJan 2026 (estimated)
- Study completionJan 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Vaccine RefusalStudies of the same condition, open and under way.
- More trials run by Hadassah Medical OrganizationThe 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
- Observational
- Observational model
- Family based
- Time perspective
- Cross-sectional
- Enrolment
- 1,000 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Hadassah Medical Organization
- Sponsor type
- University, hospital or other
- Collaborators
- Merck Sharp & Dohme LLC
- Responsible party
- Principal investigator, Tenenbaum Ariel, Hadassah Medical Organization
- Investigators
- Ariel Tenenbaum, MD, Principal investigator, Hadassah Medical Organization
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05749419
- Sponsor's protocol ID
- Tenenbaum-HMO-CTIL
- Status last verified
- Sep 2024
- First submitted
- 8 Feb 2023
- Last updated
- 3 Apr 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 3 Apr 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Questionnaires and Focus Groups Based Quantitative & Qualitative Study of Vaccine Hesitancy and Confidence Among At-risk and Marginalized Populations: Persons With Special Needs, Intellectual Disabilities and Congenital Anomalies
- ClinicalTrials.gov ID
- NCT05749419
- Acronym / sponsor ID
- Tenenbaum-HMO-CTIL
- Conditions
- Vaccine Refusal, Compliance, Patient, Disability, Intellectual, Congenital Disorders, Pediatric Disorder
- Study type
- Observational
- Recruitment status
- Unknown status
- Enrolment
- 1,000 participants (estimated)
- Lead sponsor
- Hadassah Medical OrganizationUniversity, hospital or other
- Collaborators
- Merck Sharp & Dohme LLC
- Study start
- 1 Jul 2023 (actual)
- Primary completion
- Jan 2026 (estimated)
- Study completion
- Jan 2026 (estimated)
- First posted
- 1 Mar 2023 (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.
The goal of this observational study is to learn about vaccinations hesitancy, delay or avoidance in children with chronic diseases, congenital anomalies or disabilities. The main questions it aims to answer are:
- Attitudes of caregivers towards vaccinating their children, obstacles that postpone vaccinations, and the status of vaccinations of these children.
Participants will fill out questionnaires and some will be included in focused groups for the qualitative part of the study.
Researchers will compare the vaccinations status of the research group to their siblings' status as well as the published national records of vaccination compliance.
Detailed description
Global vaccines programs prevent infectious diseases, congenital anomalies and cancer [1,2]. Full and partial avoidance of vaccines, or postponing vaccines, may lead to morbidity, disability and mortality. This is particularly significant among children and adults with special needs, intellectual and developmental disabilities, and congenital anomalies, which are at-risk groups, together representing over 15% of the general population [3,4]. Studies have shown that this population is particularly vulnerable when it comes to infectious diseases, hospitalizations, sexually transmitted diseases, abuse and neglect [5,6,7]. Furthermore, this is a marginalized population, with (in average) a lower socioeconomic status and at a lower level of education of themselves and their caregivers [8]. The reasons for hesitance, avoidance or selectivity of vaccines by the caregivers are not comprehensively characterized. Therefore, the investigators outline our thoughts and Insights from our ongoing work, for over two decades, with this population. In the investigators experience, when doctors and nurses ask the patients and their caregivers what are the reasons for less-then-optimal vaccination state, there are several explanations: concurrent illnesses that made them postpone vaccinations, access challenges, being preoccupied with many other health tasks, and paradoxically the fear that the child is too fragile for receiving the vaccine or that the vaccine itself will do harm. Also, some may be wrongly advised about contraindications that are misinterpreted. It is surprising that the infestigators hear from caregivers about the fear from the vaccines, and not about the fear from the diseases. Another important issue is the unfortunate vulnerability of this population to STD's, which the investigators repeatedly hear from caregivers that this is a non-issue for them, which is clearly a dangerous misconception [9].
Therefore, healthcare professionals are missing valuable information about possible risks and intervention opportunities among an at-risk population.
Objectives:
- The investigators will systematically map the reasons for the delay and/or avoidance, and/or hesitance to vaccinate by conducting a large-scale evaluation of current and planned immunizations among persons of all ages who have special needs, intellectual and developmental disabilities and congenital anomalies (study group). The investigatorswill use a comprehensive questionnaire to collect this information, as well as focused discussion groups for in-depth qualitative investigations. The investigators will compare the data with their sibling's vaccination status and with recruits from the general population (control group).
According to the concept "Do not talk about us without us", The investigators will include persons with special needs and disabilities in the study and make all efforts to hear directly from them in focus groups or individually about their approach to vaccinations, including hesitancies and misconceptions about the procedure.
Hypotheses:
- There is a higher prevalence of vaccine avoidance and delay among the study population.
- The reasons for avoidance and/or delay are:
- Fear of harm - The study population are perceived more fragile, hence more likely to adversely react to vaccines.
- Misconceptions about their vulnerability to STD's, and false beliefs about neurodevelopmental effects of the vaccines themselves.
This is a descriptive qualitative and quantitative study. The Quantitative part consists of comprehensive questionnaires that The investigators will design for the study. The questionnaire will have five sections: 1. Sociodemographic data. 2. Current vaccination status. 3. Delay/hesitancy/avoidance - past present and future plans. 4. Reasons for delay/hesitancy/avoidance if exist. 5. Statements regarding vaccines benefits, safety, known side effects, and misconceptions, and the participants' level of agreement with these statements. All questionnaires will be filled out anonymously after consent to participate.
For the focused groups The investigators will recruit parents and other caregivers as well as persons with disabilities. The investigators will analyze these opened and free discussions, with limited opening remarks and follow up questions for clarification, in a qualitative manner and all themes, dilemmas and experiences will be presented accordingly.
It is based on questionnaires and focus groups studies, with control groups. The investigators will conduct the research in the Hadassah- Hebrew university medical center, in collaboration with associations and institutions that provide healthcare and support for the studied population and their families.
Since The investigators have ongoing collaborations with other academic and clinical institutions in other countries, it is possible for us to explore with them a fruitful collaboration in this research, and developing it to a multicenter study.
The investigators hopefully plan to recruit a total of one thousand participants.
The study population is our patients and their families that arrive for evaluations and treatments. The investigators plan to recruit more participants with the collaboration other associations and institutions. The population is consisted of persons with a variety of disabilities, namely intellectual and developmental disability, Down syndrome, congenital syndromes and genetic disorders.
The investigators will try to include as many persons as possible, excluding those who are reluctant to participate or did not provide minimal information in the questionnaires.
As part of the study procedure and presentation of the results, The investigators will aim to conceptualize tailored programs to increase vaccination confidence and adherence, and propose a follow-up interventional study.
Study design
- Observational model
- Family based
- Time perspective
- Cross-sectional
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| study group and control group | – | –Study group - children with chronic diseases, disabilities, or congenital anomalies. Control group - their siblings. |
Who may qualify
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult, Older adult
- Study population
- Children with disabilities, chronic conditions and congenital anomalies. The parents will fiil out the questionnaires and participate in focus groups.
Key inclusion criteria (1 listed)
- Diagnosed children with disabilities, chronic diseases or congenital anomalies
Key exclusion criteria (2 listed)
- Undiagnosed children
- Inadequate filled out questionnaires
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Percentages of children in the study group who are not vaccinated, partially vaccinated, or vaccinated late, in comparison with the percentages in the control group.
Time frame: 2 years
Percecntages as described above as well as description of reasons for vaccination avoidance, delay and hesitancy, obstacles in the way to vaccinate, approach to vaccines as detaled in the questionnaires.
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 3 Apr 2025.
- Individual participant dataSharing planned: No
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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. This study is not recruiting at the moment.
Ariel Tenenbaum, MD principal investigator
Hadassah Medical Organization
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Vaccine Refusal and Compliance, Patient, run by Hadassah Medical Organization at 1 site in Israel.
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 1 inclusion and 2 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: status not confirmed, as of the sponsor's last update on 3 Apr 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 Israel. 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?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
Contact Ariel Tenenbaum, MD (+9720508573725, tene@hadassah.org.il), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Percentages of children in the study group who are not vaccinated, partially vaccinated, or vaccinated late, in comparison with the percentages in the control group. (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 3 Apr 2025.