HIV Returns In Patients Thought To Be Cured, Sends Scientists 'Back To The Drawing Board'

In a discouraging development, two men whom scientists said had been "cured" of HIV after undergoing bone marrow transplants tested positive again for the virus. The unfortunate news not only blindsided researchers who thought they might have found a cure for HIV but also highlights the virus' resilience and ability to hide in places we can't detect.