Figure 21.8 A Forensic Application of Phylogenetic Analysis This phylogenetic analysis demonstrated that strains of HIV present in a victim (shown in red) were a phylogenetic subset of viruses isolated from a physician’s patient (shown in blue). This analysis was part of the evidence used to show that the physician drew blood from his HIV-positive patient and injected it into the victim in an attempt to kill her. A jury found the physician guilty of attempted murder.