Primal Health Databank: Study
| Entry No: | 0885 |
| Title: | Effects of early-life exposure to allergens and bacteria on recurrent wheeze and atopy in urban children. |
| Author(s): | Lynch SV, Wood RA, et al. |
| Reference: | J Allergy Clin Immunol. 2014 May 28. pii: S0091-6749(14)00593-4. doi: 10.1016/j.jaci.2014.04.018. [Epub ahead of print] Effects |
| Place of Study: | USA |
| Abstract: | The Urban Environment and Childhood Asthma study examined a birth cohort at high risk for asthma (n = 560) in Baltimore, Boston, New York, and St Louis. Environmental assessments included allergen exposure and, in a nested case-control study of 104 children, the bacterial content of house dust collected in the first year of life. Associations were determined among environmental factors, aeroallergen sensitization, and recurrent wheezing at age 3 years.
Cumulative allergen exposure over the first 3 years was associated with allergic sensitization, and sensitization at age 3 years was related to recurrent wheeze. In contrast, first-year exposure to cockroach, mouse, and cat allergens was negatively associated with recurrent wheeze (odds ratio, 0.60, 0.65, and 0.75, respectively; P ≤ .01). Differences in house dust bacterial content in the first year, especially reduced exposure to specific Firmicutes and Bacteriodetes, was associated with atopy and atopic wheeze. Exposure to high levels of both allergens and this subset of bacteria in the first year of life was most common among children without atopy or wheeze.
CONCLUSIONS:
In inner-city environments children with the highest exposure to specific allergens and bacteria during their first year were least likely to have recurrent wheeze and allergic sensitization. These findings suggest that concomitant exposure to high levels of certain allergens and bacteria in early life might be beneficial and suggest new preventive strategies for wheezing and allergic diseases. |
| Keyword(s): | allergens, allergic disease, asthma, asthma in childhood, atopic diseases, atopy, bacteria, wheeze, wheezing |
| Discussion: | No discussion mentioned for this entry |
| See Also: | No related entries mentioned for this entry |
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