Characteristics of the organ samples studied here. Samples were hierarchically clustered and sorted by Metacoder. The node in the center includes all the samples. From there, in an outward direction, the samples are discriminated according to whether they come from hospitalized (H) or nonhospitalized (NH) individuals. Then it is indicated which organs the samples come from. The outermost part of the graph categorizes the samples according to methods 1, 2, and 3 results (+ positive; − negative; i indeterminate). For example, if a sample ranked positive by method 1, indeterminate by Method 2, and negative by Method 3, it was assigned to the category +i−. The nodes' size and color represent the number of samples in each category.