<p>A graph representing the transmission of HIV among patients from Europe. Vertices represent patients and are coloured by country of origin. Edges indicate transmission between connected patients.</p> <p>This graph is a result from a phylodynamic study of HIV-1 strains collected as part of a Europe wide project. The results from this study have been presented as a poster at ECCB 2012.</p> <p>The graphic was generated using the igraph package in R.</p>