Summary
This observational study recruited 40 urban gardeners to characterise the microbial transfer between garden soil and human skin during gardening activities. Using 16S amplicon sequencing, the authors found that garden soil bacteria transiently colonised gardeners' skin immediately after soil contact, with detectable imprints persisting less than 12 hours. The findings suggest that whilst individual gardening sessions produce temporary microbial transfer, regular and repeated soil contact through routine gardening may sustain ongoing skin microbiota exposure with potential immunological implications.
Regional applicability
This study was conducted in the United States and examined urban garden soils and gardening practices in that context. The findings are likely transferable to United Kingdom urban gardening environments, though soil microbial composition and diversity may vary with local climate, soil type, and land management history; UK-specific research would strengthen applicability to British gardening populations and immune-health claims.
Key measures
16S rRNA amplicon sequencing of soil and skin bacterial communities; alpha and beta diversity indices; number of shared bacterial taxa between soil and skin samples; temporal persistence of soil microbes on skin
Outcomes reported
The study characterised soil and skin bacterial communities using 16S amplicon sequencing before and after gardening in 40 volunteers, and measured the persistence of soil bacteria on human skin over time. Soil bacterial alpha diversity exceeded skin diversity, and the number of bacterial taxa shared between skin and garden soil increased immediately post-gardening but largely disappeared within 12 hours.
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