An observational study in Healthy Controls, sponsored by Mayo Clinic. Enrolling by invitation at 1 site in United States. Open to participants aged 4 Months to 21 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-01-22.
Sponsored by Mayo Clinic · Observational
The purpose of this research is to understand the normal healthy response to immunological challenge by measuring circulating cytokine and chemokine levels before and after vaccinations in healthy children. These data will define a range of normal responses that can be used to help us understand pathogenic mechanisms in children who do not respond normally to infections. In addition, this study will test the hypothesis that genetic polymorphisms in the interleukin-1 receptor antagonist gene are associated with differential inflammatory responses across the healthy spectrum.
Children who experience seizures that cannot be stopped by traditional anti-seizure medications often suffer profound brain injury and intellectual disability. Indeed, many of these children do not survive. In one study, 12% of children who developed an acute onset disease called FIRES (febrile infection-related epilepsy syndrome) died during the early stages of the disease, and of the children who survived, more than 90% developed cognitive impairment and lifelong epilepsy that could not be treated by our standard drugs. The discovery of new therapeutic strategies is therefore imperative.
A role for inflammation and the innate and adaptive immune systems in generating seizures is a burgeoning but understudied field in epilepsy research. While data from multiple human and animal studies suggests that inflammatory cytokines can drive ictogenesis, the development of strategies to modulate inflammation are hindered by insufficient knowledge regarding the dynamic range of healthy responses to infection and immunological challenge. On this basis, the investigators intend to measure changes in levels of inflammatory cytokines and chemokines in the blood induced by the normal healthy response to vaccination. To do so, the investigators will collect a small amount of blood from children just before they receive their standard vaccinations at 6 months, 12 months, or 4-6 years of age. A follow-up sample will then be collected from the same children approximately 10-14 days later. Since it is known that about 30% of children develop a fever within this timeframe, it is expected that the size of the change in inflammatory factors in each child will reflect a Gaussian distribution, with "high responders" and "low responders" centered on a mean response. For each sample the investigators will isolate serum and measure the levels of interleukin-1 beta, interleukin-6, tumor necrosis factor alpha, chemokine (C-C motif) ligand 2, chemokine (C-C motif) ligand 5, chemokine (C-X-C motif) ligand 1, chemokine (C-X-C motif) ligand 2, chemokine (C-X-C motif) ligand 8, chemokine (C-X-C motif) ligand 9, and chemokine (C-X-C motif) ligand 10.
In addition, based on recent findings showing that some children with acute seizure disorders exhibit previously unknown genetic polymorphisms in the interleukin-1 receptor antagonist (IL1RA) gene that are associated with altered immunological function, the investigators have hypothesized that normal healthy children will exhibit a spectrum of IL1RA function that will correlate with the size of their response to vaccination. To test this hypothesis the investigators will collect genomic DNA for sequencing of the IL1RA gene (also known as IL1RN) and will measure the function of the IL1RA protein in serum. This genetic and functional data will be correlated with the inflammatory cytokine and chemokine response measured in serum.
Several key findings will be made in this study.
This study is in no way based on the idea that vaccines "are bad". This study was designed because children all respond a little differently to vaccines (for example, some get sore at the injection site, some get a low fever, some feel more tired than usual) and this indicates that the body is responding to the immunization in ways that can be measured. The investigators think that the normal healthy response to vaccination will help define a range of responses that can be used to help other children who do not respond normally to infections. While this study is focused on a specific protein and on helping children who have defects in this factor, these findings will be widely relevant to understanding many diseases of the immune system in children.
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Of its 445 completed or terminated interventional studies of FDA-regulated products, 313 (70%) have results posted.
Counted across the registry records on this site, refreshed daily.
Children scheduled for vaccinations at Mayo Clinic in Rochester, MN
Exclusion Criteria:
Visit 1 This visit will take about 15 minutes and will be at the time of the next scheduled clinical vaccinations. Study procedures at this visit include : * Draw a blood sample based on age groups below * Provided a temperature diary to fill out for the next week Visit 2 This visit will take about 15 minutes and will be approximately 7 days after the first visit. Study procedures at this visit include : * Draw a blood sample based on age groups below * Collect temperature diary if not already mailed in
Other: Blood Collection
Visit 1 This visit will take about 15 minutes and will be at the time of the next scheduled clinical vaccinations. Study procedures at this visit include : * Draw a blood sample based on age groups below * Provide a temperature diary to fill out for the next week Visit 2 This visit will take about 15 minutes and will be approximately 7 days after the first visit. Study procedures at this visit include : * Draw a blood sample based on age groups below * Collect temperature diary if not already mailed in
Other: Blood Collection
Visit 1 This visit will take about 15 minutes and will be at the time of the next scheduled clinical vaccinations. Study procedures at this visit include : * Draw a blood sample based on age groups below * Provide a temperature diary to fill out for the next week Visit 2 This visit will take about 15 minutes and will be approximately 7 days after the first visit. Study procedures at this visit include : * Draw a blood sample based on age groups below * Collect temperature diary if not already mailed in
Other: Blood Collection
Blood draw
Changes in normal pediatric interleukin-1 beta levels in serum at 1 week after immunization relative to baseline.
Measurement of serum interleukin-1 beta levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric interleukin-6 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum interleukin-6 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric tumor necrosis factor-alpha levels in serum at 1 week after immunization relative to baseline.
Measurement of serum tumor necrosis factor-alpha levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric chemokine (C-C motif) ligand 2 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum chemokine (C-C motif) ligand 2 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric chemokine (C-C motif) ligand 5 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum chemokine (C-C motif) ligand 5 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric chemokine (C-X-C motif) ligand 1 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum chemokine (C-X-C motif) ligand 1 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric chemokine (C-X-C motif) ligand 2 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum chemokine (C-X-C motif) ligand 2 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric chemokine (C-X-C motif) ligand 8 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum chemokine (C-X-C motif) ligand 8 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric chemokine (C-X-C motif) ligand 9 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum chemokine (C-X-C motif) ligand 9 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Changes in normal pediatric chemokine (C-X-C motif) ligand 10 levels in serum at 1 week after immunization relative to baseline.
Measurement of serum chemokine (C-X-C motif) ligand 10 levels will be analyzed and compared between the pre-immunization and post-immunization timepoints. Response profiles will also be compared between subjects.
Time frame: Baseline, 1week
Determine the range of normal single nucleotide polymorphisms in the interleukin-1 receptor antagonist (IL-1RN) gene.
The IL-1RN gene will be sequenced from genomic DNA. Sequences will be compared between subjects and associated with cytokine and chemokine levels.
Time frame: Baseline
Plan to share: No
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