No, I know how you contract it.
Years and years ago (back in '89, I think), I knew someone who had full blown AIDS. I saw him in a restaurant and he looked so bad I gave him a hug and kissed his cheek. My bf at the time refused to kiss me afterwards, saying that I "could have got it from him". Another time, I was in the Bronx and saw that a homeless man had fallen and gashed his head. I held my kleenex against the gash until the medics got there, and the policeman that responded told me I had put myself at risk. I didn't get any blood on me; I had no open cuts or sores (not even a hangnail) on my hand...and we didn't even know this person had HIV for sure or not.
People are paranoid out of ignorance, P. Some people act paranoid to mask prejudice. I'm neither ignorant nor prejudiced.
That's a possibility, I suppose.....or I could have nicked his cheek with my vampire-like fangs and swallowed enough of his blood to put me at risk.