FIG 2.

Phylogenetic trees of sequences from households where all participants had indistinguishable consensus sequences. Shown are four representative trees. Trees from 11 other households are shown in Fig. S1 to 4 in the supplemental material. Each tree is labeled with the household identifier (NY, New York; UT, Utah; PR, Puerto Rico). The tips of household sequences are colored cyan and those from nonhousehold participants in the same community in the same state or territory (2-letter abbreviation) are colored magenta. All other tips are colored black. The collection date for each specimen is indicated. Genetic distance is represented by the bar and corresponds to one mutation.