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We included in our analysis all studies found on the EBI Metagenomics website (https://www.ebi.ac.uk/metagenomics/) that had more than 200 participants (independent samples) and which used Illumina Miseq instruments. We pooled raw 16S rRNA sequencing data from the EBI Metagenomics website, and used taxonomic assignment (TSV) files for analysis. The number of sequence reads was used to analyse how many samples contained S. aureus or B. subtilis. Samples with a read number of more than 0 were defined as colonized. When there were no reads, samples were designated as noncolonized.