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To date, there is little known about the incidence of celiac disease (CD) in children in the United States. Studies; research efforts demonstrate that the incidence of CD continues to increase in the United States and Europe, now occurring in an estimated 1 to 3 percent of children.
Despite the growing prevalence of CD, clinical trials aiming to prevent its development via dietary modifications in infancy haven’t been successful. And while a gluten-free diet is an effective treatment option for CD, there remains a need for diagnostic evidence and universal screening ss many cases of CD are not diagnosed or treated. Furthermore, there is currently no known optimal age to test for CD, so repeat testing is often necessary.
A previous study conducted by researchers here at the Digestive Health Institute at Children’s Hospital Colorado found the cumulative incidence of CD at 5 years old as .09 percent.
The research team followed a total of 1,339 children with DQ genotypes — genotypes that are considered susceptible to celiac disease and type 1 diabetes – from a young age. The participants were followed for up to two decades to determine if they would develop tissue transglutaminase autoantibodies (tTGA).
Between 1993 and 2004, the Diabetes Autoimmunity Study in the Young completed HLA-DR, DQ genotyping in 31,766 Denver newborns. This study recruited newborns that were born with HLA genotypes associated with CD as well as 54 subjects without an HLA risk for type 1 diabetes or CD soon after birth. To supplement the group at risk for CD, the research team also enrolled 2-year-old subjects with additional high-risk celiac genotypes.
Subjects had blood draws for tTGA at 9, 15 and 24 months of age; any positive tests were repeated in three to six months. Patients were referred to a pediatric gastroenterologist after two positive tTGA blood tests.
CDA was defined as positive tTGA persistent on two consecutive blood draws at least three months apart or a single positive tTGA test and intestinal biopsy confirming CD. CD was defined as tTGA plus a Marsh 2 or 3 lesion on intestinal biopsy or CDA with high tTGA levels (greater than 0.5) on at least two visits.
In this 20-year prospective study of 1,339 children who had genetic risk factors for celiac disease, our research team found the continued development of CD through early childhood. By age 15, about 3.1 percent of the Denver population will develop CD and another 2 percent will develop a lesser degree of CDA.
The study indicates that most occurrences of celiac autoimmunity develop before the age of 10, which could inform future universal celiac disease screening efforts.