A toddler thought to have been cured of HIV now has detectable levels of the virus in her blood, the child's doctors and U.S. health officials said Thursday.

The Mississippi child's stunning story, first disclosed at a medical meeting in March 2013, was the first account of an HIV-infected infant achieving what appeared to be a cure after receiving aggressive drug treatment within the first 30 hours of life.

The case raised hopes that more of the roughly 250,000 children who are born each year infected with the human immunodeficiency virus, which causes AIDS, might have a shot at a cure.