I had this problem once many years ago. One of the ladies tested positive. She came to Perth and helped me out as a housekeeper whilst doing all the tests and interviews.
She always tested positive at Royal Perth hospital and always tested negative at King Edward.
I was amazed that in her first two hour health interview they tested her safe sex knowledge then virtually said she could carry on working as long as she practiced safe sex.
I questioned the departments motives on allowing HIV to continue working and they pointed out that it was against Federal Law to discriminate of prevent anyone from earning a income.
This lady never returned to sex work and after three months it was discovered that because she had Ross river virus, this was giving the false readings and that she was not HIV positive.
What I did discover was that two workers were working in Perth at that time with HIV.
All they would ever say was that neither worked for me.
You must also note that Trans are considered ladies by the health department and they are not allowed to differenate, so this worker could be a TG girl.
Lastly any client/guy that practices penetrative unsafe sex with a sex worker or a casual partner is a bloody idiot.
Remember ladies that we are ten times more likely to pick up a HIV infection from a male with the infection, than a male picking it up from a lady.
From recall the chance is 1/10 for woman, meaning if we bonk 10 guys with HIV we get it.
1/100 for men. Men would have to bonk 100 ladies to pick up the infection. Remember who can say if it would be the first or the last.
Practice safe sex, use condoms and the chances reduce to 1/10,000-1/100,000