But the girl’s recovery is tremendous. In fact, the girl, 3, is now so healthy that doctors had to double check that she had been truly born with the disease — that the tests weren’t positive simply because she was exposed to the virus in her mother’s blood, The Associated Press reported.

The New England Journal of Medicine clarified, however, in a Wednesday report that the girl was truly infected. She underwent aggressive treatment for 18 months. The treatments and medicines were halted and since, she’s shown no signs of active infection.