Worm infestations and development of autoimmunity in children - The ABIS study

Area of Science:

• Immunology
• Epidemiology
• Pediatrics

Background:

• Worm infestations are known to modulate the immune system.
• This immune modulation has been hypothesized to potentially reduce the risk of autoimmune diseases.

Purpose of the Study:

• To investigate the association between childhood worm infestations and the subsequent development of autoimmune diseases.
• To determine if children with autoimmune conditions were less likely to have experienced worm infections during childhood.

Main Methods:

• Prospective, population-based cohort study (ABIS-study) of children born in southeast Sweden (1997/99).
• Data collected via parental questionnaires on worm infestations at ages 1, 5, and 8.
• Linked registry data for autoimmune disease diagnoses (Type 1 diabetes, celiac disease, Juvenile Rheumatoid Arthritis) and drug prescriptions.

Main Results:

• No significant differences in worm infestation incidence at ages 1, 5, or 8 were observed between children who developed autoimmune diseases and healthy controls.
• At age 8, 20.0% of the general child population reported a worm infestation; rates were similar for children who later developed Type 1 diabetes (21.3%), celiac disease (19.5%), and JRA (18.8%).
• No differences in anti-worm medication prescriptions were found between children who developed autoimmune diseases and controls.

Conclusions:

• The study found no evidence to support the hypothesis that childhood worm infestations play a protective role in the development of Type 1 diabetes, celiac disease, or Juvenile Rheumatoid Arthritis in Sweden.
• These findings suggest that worm infestations in childhood do not appear to influence the risk of developing these specific autoimmune diseases.