<p>y-axis denotes count of subjects per bin. x-axis denotes cumulative score. Single and double letters above the bins correspond to patient IDs. The cumulative score represents a sum per patient from data presented in the Summary Table in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0016714#pone-0016714-g007" target="_blank">Figure 7</a>. Three categories of HIV-1 transmission multiplicity include transmission of “single,” “undetermined,” and “multiple” viral variants.</p
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