A Mississippi three-year-old who was supposedly cured of HIV last year has relapsed, disappointed federal officials announced today. Known as the "Mississippi baby," the child was the first to ever to rid herself of the virus.

The girl had been off antiretroviral therapy for two years before the virus came back. She has now resumed therapy. Hannah Gay, a pediatric HIV specialist who treated her, told USA Today, "Ever since we discovered this case in 2012, we knew this could happen," but it still feels like a "punch in the gut."

The girl was born with the virus, and stopped taking medication around 18 months after she and her mother briefly vanished.

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