Here in the US, there are laws against discrimination due to HIV, but I'll tell you, even in the workplace, if people find out, people will indeed avoid you- they won't use the restroom you use, they won't use your phone, will don gloves if they have to work on your computer or desk, carrying small spray bottles of rubbing alcohol, Clorox wipes, etc. and will cross the office to avoid you- not everyone will, but quite a large number of people will. In addition, employers reserve the right to check your desk, locker, bags, handbags, - even your car when you park in their lot- and personal belonging when you walk into their facilities, so privacy is out-the-door, and when one person, regardless of the reason, starts to affect the dynamic of the business environment negatively, whether their fault or not, they will get "managed out" for a legally defensible reason eventually.
And that is in the office!
It seems that even when people know what science says (and many people don't know, or just don't trust the data) about transmission and exposure, people are still scared and feel unsure because it isn't yet curable- it's a BIG risk. As far as in the home, the home is a very personal place, where people don't want to feel scared or concerned. That's what I think this comes down to; if a family can't feel comfortable and secure in their own home, with a house-help or for whatever reason, especially when it comes to children, the relationship is broken beyond repair, and can't survive.
But at any rate, I would hope that a house-help breastfeeding the family's kid, or worse... (!) would end that relationship sooner, rather than someone having HIV. Maybe the solution is some ground-rules and a steady supply of Hydrogen Peroxide.
Best,
Hill