Fig. 1. Spatiotemporal sampling of Staphylococcus epidermidis from nine newborn infants.

Patients are indicated by color, where different shades of the same color correspond to twins. At each of 1–4 time points, infants were swabbed at numerous body sites (not all depicted; see “Methods” section). Swabs were cultured on Staphylococcus-selective media (see “Methods” section), from which we collected multiple single colonies. Colonies were harvested and subjected to whole-genome sequencing and antibiotic resistance phenotyping.