FIG. 3.

Phylogenetic relationships of bacterial sequences from shower water and shower aerosol samples for four hot water risers in a stem cell transplant unit during two seasons. (A) Unrooted phylogenetic tree showing all sequences and their origin; (B) maximum-likelihood phylogenetic tree of selected sequences from the subclass Corynebacterineae originating from our environmental samples and from the Greengenes database; and (C) maximum-likelihood phylogenetic tree of selected members of the class Gammaproteobacteria originating from our environmental samples and from the Greengenes database. The bootstrap numbers were generated with a neighbor-joining analysis in panels B and C. The scale bar represents base changes per site in panels B and C.