There's a widespread belief that people who know they are infected with HIV will act responsibly and change their risky behavior.
"Real-world evidence of such change is discouraging, especially for the large majority who test negative," Shelton writes.
And he notes that people recently infected with HIV are the most infectious -- yet test negative for HIV.
Dickinson says that while testing is not the sole answer to the HIV epidemic, it does help people reduce their risk behavior.
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