Sorry if my reference to AIDS was interpreted as an attempt to scare/panic. I lived for over a decade in the heart of the AIDS epidemic in California. I knowingly hired folks with the condtion, and lived closely with people who both lived and died with AIDS. I'm so used to it I don't see the name and feel frightened, and I overlooked that others do not share that view.
Indeed - education and information are the beginning of good heath and disease prevention.
Patient Zero was noted only because it was a fascinating study, and one that was able to take a big epidemic and trace it back to a local vector. In the case of Patient Zero, some of the lessons were that affluence does not provide an invisible shield, and that disease prevention is everbodys job.