Researchers remain hopeful that they're heading in the right direction to finding a cure for HIV/AIDS.
Two babies who were treated as infants for HIV lived for years without any signs of the virus.
Now, one of them is testing positive for HIV again.
But the treatments at least held the virus at bay for a while -- and that could lead to changes in treatments for people recently infected.
HIV is spread when blood, semen, or vaginal fluids from an infected person enter another person's body, usually through sexual contact, from sharing needles when injecting drugs, or from mother to baby during birth.
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