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NMDS analyses of skin bacterial communities. (A) Before and after touching sand materials and sand materials containing 5% microbial inoculant (details in Experimental design). (B) The original skin bacterial communities of different study persons. (C) Skin bacterial communities after touching three different sands. (D) Skin bacterial communities after touching three different sands containing 5% microbial inoculant. TH, safety sand; SH, sieved sand; LH, sand box sand.
