The enteric DNA virome differs in infants at risk for atopic disease.

Atopic disease prevalence, including atopic dermatitis, food allergy, asthma, and allergic rhinitis, has risen dramatically in industrialized countries. Traditional, single family farming lifestyles protect against atopic disease, but the mechanisms are incompletely understood. While there are established epidemiologic connections between childhood respiratory viral infections and the infant gut bacterial microbiome with allergic disease development, the influence of the early enteric virome on atopic disease development is unknown. We analyzed the enteric virome in 131 infants from high-atopy-risk urban/suburban environments and low-atopic-risk single-family farming communities. While similar at 12 months, enteric bacteriophage communities significantly differed by farm-life versus urban lifestyle at six weeks and six months of age. A lifestyle protective from atopic disease demonstrated higher colonization rates of Bifidobacterium longum subsp. infantis (B. infantis), an important beneficial commensal, with phageome communities differing in infants colonized by B. infantis at all time points. Simultaneously, Mastadenovirus and Bocaparvovirus were more prevalent in urban infant stools at six months of age. Sparser phage-phage networks were found at all timepoints in infants who later developed atopic disease. These data suggest that the early infant enteric DNA virome develops differently in farming and urban lifestyles and may factor into risk of atopic disease development.