HIV was also spread, for a while, through contaminated medical blood products. Arthur Ashe seems to have contracted it that way, getting a transfusion when he had heart surgury. There were several cases of hemophiliacs getting HIV.
That has been cut back since the smart guys developed tests that would detect fairly low levels of HIV positive antibodies in blood. Still, it is a good idea to stockpile your own blood before you have scheduled surgery.
Actually it was tens of thousands. It was a huge scandal for the Red Cross.