I see what you're asking. As I mentioned, I have never, nor has anyone I know, ever deliberately infected anyone. I can, however, share this bit of information from when I worked on a project tracking Hepatitis C virus quasispecies transmission through the population. Hepatitis C has a high rate of mutation. Every time it replicates, there is a high likelihood that it will pick up a small alteration in its genetic sequence. The group of disparate HepC viruses as a whole with their variances is called quasispecies. When we would sequence and examine the virus isolated from sick patients we would know precisely who infected whom. If the virus was identical between two infected people we knew they were closely involved and if the virus was very different we knew the two people were not involved in the same chain of transmission. The patient record regarding personal history and reported contacts would corroborate our findings.