Also this is from 1987 and directly from the article, "unrecognized or forgotten needle-stick exposures to other infected patients cannot be totally excluded. The exact route of transmission in these three cases is not known."
I ecourage you to stop searching online for things like that, will only cause you more harm and not believe the CORRECT advice you have been given.
We can't explain the unexplainable or lies. Sorry but they have 2 people who they claim have HIV yet 2 other people from the same incident does not have HIV.