Thank you very much, all teachers here. I've learned new things here every day. I should have said 'tested positive for HIV (RATHER THAN AIDS).
By the way, I thought both AIDS and Aids were good spellings because I read 'AIDS or Aids' in MACMILLAN without much thinking. In that way I could remember the spelling the easier way.
Thank you heartily (I wanted to try another way to say thank you but does this sound naturally?) again.