Genomic diversity in asymptomatically carried nasal populations of Staphylococcus aureus.

aRecent antibiotic use: ★ amoxicillin, ★★ antibiotic with expected anti-staphylococcal activity (trimethoprim or ciprofloxacin). bAverage SNP divergence between colonies. cSingle-locus variant of ST22.MLST: multilocus sequence type, MRSA: methicillin resistant Staphylococcus aureus, syn: synonymous, stop: premature stop codon, CDS: coding sequence, SNP: single nucleotide polymorphism, indel: insertion/deletion, ST: sequence type, CC: clonal complex.