On the dentist alleged to have given people AIDS intentionally

http://www.nytimes.com/1991/07/30/health/the-doctor-s-world-an-aids-puzzle-what-went-wrong-in-dentist-s-office.html

Is not a bad place to start.

In addition, see:

http://www.annals.org/content/124/2/255.full

But see (and do not skip)

http://www.annals.org/content/124/2/250.full (which disagrees with the above)

and http://www.people.com/people/archive/article/0,,20113381,00.html which suggests that stories of the one patient being LDS are false.

Just an update, since what I'd read and heard in the past is not necessarily accurate.