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Published in: Allergy, Asthma & Clinical Immunology 1/2013

Open Access 01-12-2013 | Research

Infant gut microbiota and the hygiene hypothesis of allergic disease: impact of household pets and siblings on microbiota composition and diversity

Authors: Meghan B Azad, Theodore Konya, Heather Maughan, David S Guttman, Catherine J Field, Malcolm R Sears, Allan B Becker, James A Scott, Anita L Kozyrskyj, CHILD Study Investigators

Published in: Allergy, Asthma & Clinical Immunology | Issue 1/2013

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Abstract

Background

Multiple studies have demonstrated that early-life exposure to pets or siblings affords protection against allergic disease; these associations are commonly attributed to the “hygiene hypothesis”. Recently, low diversity of the infant gut microbiota has also been linked to allergic disease. In this study, we characterize the infant gut microbiota in relation to pets and siblings.

Methods

The study population comprised a small sub-sample of 24 healthy, full term infants from the Canadian Healthy Infant Longitudinal Development (CHILD) birth cohort. Mothers reported on household pets and siblings. Fecal samples were collected at 4 months of age, and microbiota composition was characterized by high-throughput signature gene sequencing.

Results

Microbiota richness and diversity tended to be increased in infants living with pets, whereas these measures were decreased in infants with older siblings. Infants living with pets exhibited under-representation of Bifidobacteriaceae and over-representation of Peptostreptococcaceae; infants with older siblings exhibited under-representation of Peptostreptococcaceae.

Conclusions

This study provides new evidence that exposure to pets and siblings may influence the early development of the gut microbiota, with potential implications for allergic disease. These two traditionally protective “hygiene hypothesis” factors appear to differentially impact gut microbiota composition and diversity, calling into question the clinical significance of these measures. Further research is required to confirm and expand these findings.
Appendix
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Metadata
Title
Infant gut microbiota and the hygiene hypothesis of allergic disease: impact of household pets and siblings on microbiota composition and diversity
Authors
Meghan B Azad
Theodore Konya
Heather Maughan
David S Guttman
Catherine J Field
Malcolm R Sears
Allan B Becker
James A Scott
Anita L Kozyrskyj
CHILD Study Investigators
Publication date
01-12-2013
Publisher
BioMed Central
Published in
Allergy, Asthma & Clinical Immunology / Issue 1/2013
Electronic ISSN: 1710-1492
DOI
https://doi.org/10.1186/1710-1492-9-15

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