Re: high viral load of hiv in saliva? dangerous?

There are hundreds of thousands of people with HIV who kiss their uninfected partners and almost no cases of HIV transmission reported by that route. Biting and other blood-saliva contact is much more rare, but as the case you linked to illustrates, it is possible for HIV to be transmitted by blood-saliva contact.

There are a very few cases a bit similar to this, where HIV-infected infants are believed to have transmitted HIV to their mothers during breastfeeding. In those cases, the infants were infected in the hospital through infected transfusions or re-use of needles. The virus was then later transmitted to the mothers through breastfeeding.

Out of millions of cases of HIV infection in the world, only a very few are reported to be through any kind of blood-saliva contact. Transmission by this route is very rare, but not impossible.