21% of people living with HIV in the U.S are unaware of their status
I had no clue the number was that big, then after a moment of thought I wondered how they came up with this number... if they don't know how does the researcher?
One possible method: Blood from donors is checked for HIV. If the person ends up having HIV, ask the person if he/she was aware. Then account for the people who normally wouldn't give blood.
I had no clue the number was that big, then after a moment of thought I wondered how they came up with this number... if they don't know how does the researcher?