Should Younger Siblings of Peanut-Allergic Children Be Assessed by an Allergist before Being Fed Peanut?

Area of Science:

• Pediatric Allergy and Immunology
• Genetics of Allergic Diseases
• Public Health and Epidemiology

Background:

• Peanut allergy is a common and potentially severe food allergy.
• Understanding familial risk factors is crucial for early detection and prevention strategies.
• Previous studies suggest a genetic predisposition to peanut allergy.

Purpose of the Study:

• To quantify the risk of peanut allergy in siblings of children diagnosed with peanut allergy.
• To provide evidence-based recommendations for managing peanut introduction in at-risk families.
• To assess the prevalence of peanut allergy within sibling cohorts.

Main Methods:

• A survey of 560 households in Manitoba, Canada, with children born in 1995 was conducted.
• Index children (8-10 years old) underwent clinical assessment and allergy testing for peanut allergy.
• Parental surveys collected data on peanut allergy status in siblings.

Main Results:

• The prevalence of peanut allergy was 5.6% in index children.
• Overall sibling peanut allergy prevalence was 1.7% (15 out of 900 siblings).
• Siblings of peanut-allergic children had a markedly increased risk (OR 6.72), with 8.5% affected compared to 1.3% in siblings of non-allergic children.

Conclusions:

• There is a substantially elevated risk of peanut allergy in siblings of peanut-allergic children.
• Routine allergy assessment by a qualified allergist is strongly recommended before feeding peanut products to these siblings.
• This finding underscores the importance of family history in assessing food allergy risk.