Study Investigates Link Between Children’s Antibiotics and Autoimmune Diseases

Background on Autoimmune Diseases

Recent research has explored the potential connection between the use of antibiotics in children and the increasing prevalence of autoimmune diseases, such as type 1 diabetes (T1D) and celiac disease (CD). Autoimmune diseases occur when the immune system mistakenly attacks the body’s own cells. The rise in these conditions is thought to be partially influenced by the growing use of antibiotics during early childhood. However, some studies indicate that antibiotics may actually lower the risk of developing autoimmune diseases like T1D and CD.

Importance of Understanding Antibiotic Use

Clarifying the effects of antibiotic use on the onset of autoimmune diseases could enhance our understanding of the risks and benefits associated with these medications. This knowledge would enable healthcare providers and parents to make more informed choices regarding the treatment of young patients.

Study Overview

A recent study published in JAMA Pediatrics examined the relationship between antibiotic use and the development of T1D or CD in children aged four years and under. The study included children born in hospitals across Finland, Germany, Sweden, and the United States from November 20, 2004, to July 8, 2010. Only children with a heightened risk for developing T1D or CD—either due to specific genetic markers or having a family history of the diseases—were included.

Methodology

Researchers collected blood samples from participants four times a year between the ages of three months and four years. These samples were tested for antibodies indicative of an autoimmune response related to T1D and CD. Specifically, blood was screened for antibodies against the insulin-producing Islets of Langerhans (anti-ILs) and an enzyme associated with intestinal protection, tissue transglutaminase (anti-tTGA), which is often present in individuals with celiac disease. Parents documented any antibiotic prescriptions their children received during the first four years of life, categorizing them as β-lactams, amoxicillins, penicillins, cephalosporins, or macrolides.

Findings

By August 2014, the study included a total of 8,495 children, with a recorded 38,152 antibiotic exposures over the ten-year period. Amoxicillins accounted for 42% of these exposures, while 70% of antibiotic use before age four involved either β-lactams or macrolides. Notably, penicillin prescriptions were more prevalent in Sweden, whereas amoxicillin was frequently prescribed in Finland and the United States. By their first birthday, 72% of the children had received two or fewer antibiotic doses; by the fourth year, 35% had received two to three doses, and 38% had received four or more doses.

At the age of four, 5.5% of the children tested positive for anti-ILs, and 12% had anti-tTGA. The presence of these antibodies was typically first detected around 21 months for anti-ILs and 31 months for anti-tTGA. Importantly, the study found no correlation between antibiotic exposure during the first four years of life and the presence of either anti-ILs or anti-tTGA.

Conclusions and Future Research Directions

The study concludes that increased antibiotic use in children does not correlate with a heightened risk of developing type 1 diabetes or celiac disease. Future investigations into the impact of antibiotics on other autoimmune diseases may benefit from utilizing medical records to obtain antibiotic exposure data, potentially minimizing reporting errors. Additionally, including children not at risk for T1D or CD could provide valuable context for future findings.

Reference

Kemppainen, K.M. et al. (2017). Association Between Early-Life Antibiotic Use and the Risk of Islet or Celiac Disease Autoimmunity. JAMA Pediatr. doi:10.1001/jamapediatrics.2017.2905