Locations of surface sampling performed in two NICU facilities.

<p>Locations of surface sampling performed in two NICU facilities.</p

Most common bacterial genera (with known opportunistic pathogens) found in both NICUs (see Tables S1 and S2 for full list).

<p>Most common bacterial genera (with known opportunistic pathogens) found in both NICUs (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0054703#pone.0054703.s001" target="_blank">Tables S1</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0054703#pone.0054703.s002" target="_blank">S2</a> for full list).</p

PCoA analysis of NICU samples and previously published indoor studies.

<p>PCoA of pair-wise weighted UniFrac distances (see Methods) both with biplots that include taxonomy (A), and without biplots (B). The different colored points indicate the various indoor sampling environments Most of the NICU samples cluster with other indoor surface samples, except for nine NICU1 samples in the top left which cluster with a single office surface sample. Order-level taxonomy illustrates that the presence of Enterobacteriales contributes to the distinct clustering of these samples.</p

Likely sources of microbes in the two NICUs.

<p>SitePainter images display the results from SourceTracker. The NICU sites are colored on a heatmap scale, where blue indicates that low similarity between a sink and a source and red indicates high similarity between a sink and a source Many surfaces have microbial compositions that are not similar to any of the sources (represented by Unknown), while the handles of the drawers, door and faucet, and the keyboard of the incubator, resemble the communities of human skin.</p