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Infant pacifier sanitization and risk of challenge-proven food allergy: A cohort study
Victoria X Soriano1, Jennifer J Koplin1, Mike Forrester2
1Population Health, Murdoch Children's Research Institute, Parkville, Australia; Department of Paediatrics, University of Melbourne, Parkville, Australia.
Insights
Infant pacifier use, especially with antiseptic cleaning, is linked to increased food allergy risk by age one. This study highlights the potential impact of sanitization methods on infant immune development and allergy susceptibility.
Area of Science:
- Pediatric Allergy and Immunology
- Environmental Microbiology
- Immune System Development
Background:
- Environmental microbial exposures influence immune development and food allergy risk.
- Understanding factors affecting infant immune maturation is crucial for allergy prevention.
Purpose of the Study:
- To investigate the association between infant pacifier use and sanitization practices with the risk of developing food allergy by 1 year of age.
- To determine if specific cleaning methods for pacifiers impact food allergy development.
Main Methods:
- A birth cohort study followed 894 families from gestation to infant age 1 year.
- Data on pacifier use and sanitization methods were collected via questionnaires at multiple time points.
- Food allergy was assessed at 12 months using challenge-proven methods.
Main Results:
- Pacifier use at 6 months was associated with increased food allergy risk.
- The combination of pacifier use with antiseptic cleaning showed a significantly higher risk of food allergy.
- Antiseptic cleaning of pacifiers, even without overall pacifier use, was linked to elevated food allergy risk.
Conclusions:
- This study provides the first evidence linking pacifier-antiseptic use to a higher risk of food allergy.
- Further research is warranted to explore the biological mechanisms underlying this association.
Background:
Environmental microbial exposure plays a role in immune system development and susceptibility to food allergy.
Objective:
We sought to investigate whether infant pacifier use during the first postnatal year, with further consideration of sanitization, alters the risk of food allergy by age 1 year.
Methods:
The birth cohort recruited pregnant mothers at under 28 weeks' gestation in southeast Australia, with 894 families followed up when infants turned 1 year. Infants were excluded if born under 32 weeks, with a serious illness, major congenital malformation, or genetic disease. Questionnaire data, collected at recruitment and infant ages 1, 6, and 12 months, included pacifier use and pacifier sanitization (defined as the joint exposure of a pacifier and cleaning methods). Challenge-proven food allergy was assessed at 12 months.
Results:
Any pacifier use at 6 months was associated with food allergy (adjusted odds ratio, 1.94; 95% CI, 1.04-3.61), but not pacifier use at other ages. This overall association was driven by the joint exposure of pacifier-antiseptic use (adjusted odds ratio, 4.83; 95% CI, 1.10-21.18) compared with no pacifier use. Using pacifiers without antiseptic at 6 months was not associated with food allergy. Among pacifier users, antiseptic cleaning was still associated with food allergy (adjusted odds ratio, 3.56; 95% CI, 1.18-10.77) compared with no antiseptic use. Furthermore, persistent and repeated antiseptic use over the first 6 months was associated with higher food allergy risk (P = .029).
Conclusions:
This is the first report of a pacifier-antiseptic combination being associated with a higher risk of subsequent food allergy. Future work should investigate underlying biological pathways.
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