Allergic family history as a protective determinant to helminthic infection

Area of Science:

• Pediatric Allergy and Immunology
• Infectious Diseases
• Epidemiology

Background:

• Allergic diseases are common in childhood.
• Helminthic infections are prevalent globally, particularly in tropical regions.
• The relationship between allergy and parasitic infections is complex and warrants further investigation.

Purpose of the Study:

• To investigate the association between a family history of allergic diseases and the development of helminthic infections in children.
• To determine if allergic predisposition influences susceptibility to parasitic worm infections.

Main Methods:

• Prospective cohort study of Thai children (Prospective Cohort Study of Thai Children - PCTC) born in 2001.
• Family histories of allergies were confirmed by physician diagnoses and medical records.
• Stool examinations were performed on children aged 18 to 36 months to detect helminth infections.

Main Results:

• A family history of allergy was present in 5.4% of the 659 children with complete data.
• Prevalence rates for any helminth, Ascaris lumbricoides, Trichuris trichiura, and hookworm were 25.0%, 18.2%, 9.2%, and 5.3%, respectively.
• Children with a family history of allergy had a significantly lower adjusted odds ratio (0.28) for helminthic infection.

Conclusions:

• A family history of allergic diseases is independently associated with increased resistance to helminthic infections in children.
• This finding suggests an inverse relationship between allergic tendencies and susceptibility to parasitic worms.
• Further research is needed to elucidate the immunological mechanisms underlying this association.