By the end of 2003, an estimated 1.2 million persons in the United States were living with HIV. It's also estimated that 24 to 27 percent of those people are undiagnosed and unaware of their infection.
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Source
Rhodes, GM., "Estimated HIV Prevalence in the United States at the End of 2003". National HIV Prevention Conference; 1 Jun 2005; Atlanta. Abstract 595.

