Thank you for your inquiry. From what we gather from the question, you were asking about this article (Can HIV spread through saliva? Case has doctors thinking.), which profiles a rare circumstance where a father had acquired HIV through a bite from his son who is living with HIV.
It appears as if this scenario involved several extenuating circumstances in which HIV was able to pass from one person to the other. It is correct saliva is not considered an avenue of HIV transmission (1). However, if permitted, certain conditions may permit HIV transmission to occur; such as the presence of a substantial amount of blood in the saliva. The article appears to be missing some details, as the 'bite' had indeed broken the skin, yet there was reportedly no amount of visible blood in the biters mouth. It could be difficult in this case to determine that transmission had occurred through the avenue of saliva, when there was a large possibility of blood from both the biter and the victim involved.
All the best,
AIDS Vancouver Helpline/Online, Cody