Fig. 3

Diversity of the 65 university campus buildings. a The average number of OTUs observed for each building. Each point consists of up to six samples, with two per sample date. Error bars represent the standard deviation. b Shannon index for each door, organized by building. Blue points represent swabs that were associated with visible debris, whereas red points indicate swabs without debris. The bottom row is color coded according to the faculty or specific campus function of the building