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The bacterial microbiota of CSF DNA are indistinguishable from that of negative controls. Box plot summarizing the beta diversities within CSF DNA specimens and between CSF DNA and other specimens (skin swab samples, oral swab samples, sterile swabs, and negative [normal saline]) using Bray-Curtis dissimilarity. Statistical significance was assessed by Wilcoxon test, whose significance level is indicated with asterisks (***, P < 0.001).
