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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.

Unknown status

Status not confirmed. The sponsor has not verified this record for over two years, so it may be out of date.

Official record
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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
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.

Ariel Tenenbaum, MD contact

+9720508573725

tene@hadassah.org.il

Hadas Lemberg, PhD contact

00 972 2 6777572

lhadas@hadassah.org.il

Israel1 site, 1 recruiting
  • Hadassah medical center

    Jerusalem, 92140

    Ariel Tenenbaum, 0508573725, tene@hadassah.org.il

    Recruiting

Other trials in Israel

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:

  1. 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:

  1. There is a higher prevalence of vaccine avoidance and delay among the study population.
  2. The reasons for avoidance and/or delay are:
  3. Fear of harm - The study population are perceived more fragile, hence more likely to adversely react to vaccines.
  4. 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.

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 groups in NCT05749419
Study groupRoleWhat they receive
study group and control groupStudy 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.

  1. 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.

  1. First posted1 Mar 2023
  2. Study start1 Jul 2023
  3. Primary completionJan 2026 (estimated)
  4. Study completionJan 2026 (estimated)

Resources

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)
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

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.

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