<p>Each label represents the mean index of a virus or virus clade. The vertical axis is used to elucidate the clustering of points by forcing overlapping labels (phylogenies with similar indices) to ‘pile up’ like a histogram. A higher Colless’ index corresponds to a less ‘balanced’ tree in which branching events tend to occur along the same lineage. A conventional histogram is displayed in the background. Labels are defined as follows: AstV = <i>astrovirus</i>; CCHF = <i>Crimean-Congo hemorrhagic fever virus</i>; ChikV = <i>chikungunya virus</i>; CA24v = <i>coxsackievirus A24</i>; DEN = <i>dengue virus</i>; E30 = <i>echovirus 30</i>; EMCV = <i>encephalomyocarditis virus</i>; EV71 = <i>enterovirus 71</i>; GBVC = <i>GB virus C</i>; HTNV = <i>Hantaan virus</i>; H[A-E]V = <i>hepatitis [A-E] virus</i>; HIV = <i>human immunodeficiency virus type 1</i>; I[A-C]V = <i>influenza [A-C] virus</i>; JEV = <i>Japanese encephalitis virus</i>; MeV = <i>measles virus</i>; MuV = <i>mumps virus</i>; MVEV = <i>Murray valley encephalitis virus</i>; NV = <i>Norwalk virus</i>; OROV = <i>Oropouche virus</i>; hPIV-1 = <i>human parainfluenza virus</i>; PV = <i>poliovirus</i>; Rab = <i>rabies virus</i>; Rot = <i>human rotavirus</i>; RhiV = <i>human rhinovirus</i>; RSV = <i>human respiratory syncytical virus</i>; Rub = <i>rubella virus</i>; RVF = <i>Rift valley fever virus</i>; SapV = <i>sapovirus</i>; SeoV = <i>Seoul virus</i>; TBEV = <i>tick-borne encephalitis virus</i>; WNV = <i>West Nile virus</i>; YFV = <i>yellow fever virus</i>.</p
