The Mississippi adolescent is now two-and-a-half years old and has been off medication for about a year with no signs of infection.
More testing needs to be done to see if the analysis - accustomed aural hours of bearing - would plan for others.
If the babe stays healthy, it would be the world's additional arise 'cure'.
Dr Deborah Persaud, a virologist at Johns Hopkins University in Baltimore, presented the allegation at the Conference on Retroviruses and Opportunistic Infections in Atlanta.
"This is a affidavit of abstraction that HIV can be potentially curable in infants," she said.
Cocktail of drugs
In 2007, Timothy Ray Brown became the aboriginal getting in the apple believed to accept recovered from HIV.
His infection was eradicated through an busy analysis for leukaemia that complex the abolition of his allowed arrangement and a axis corpuscle displace from a donor with a attenuate abiogenetic alteration that resists HIV infection.
In contrast, the case of the Mississippi babyish complex a cocktail of broadly accessible drugs, accepted as antiretroviral therapy, already acclimated to amusement HIV infection in infants.
It suggests the abrupt analysis wiped out HIV afore it could anatomy hideouts in the body.
These alleged reservoirs of abeyant beef usually rapidly reinfect anyone who stops medication, said Dr Persaud.
The babyish was built-in in a rural hospital area the mother had alone just activated absolute for HIV infection.
Because the mother had not been accustomed any prenatal HIV treatment, doctors knew the babyish was at top accident of getting infected.
Researchers said the babyish was afresh transferred to the University of Mississippi Medical Center in Jackson.
Once there, paediatric HIV specialist Dr Hannah Gay put the babyish on a cocktail of three accepted HIV-fighting drugs at just 30 hours old, even afore class tests came aback acknowledging the infection.
"I just acquainted like this babyish was at higher-than-normal accident and adapted our best shot," Dr Gay said.
The analysis was connected for 18 months, at which point the adolescent abolished from the medical system. Five months afterwards the mother and adolescent angry up afresh but had chock-full the analysis in this interim.
The doctors agitated out tests to see if the virus had alternate and were afraid to acquisition that it had not.
Dr Rowena Johnston, of the Foundation for Aids Research, said it appeared that the aboriginal action that started anon afterwards bearing worked.
"I in fact do accept this is actual exciting.
"This absolutely is the aboriginal accurate case that we can absolutely accept from all the testing that has been done.
"Many doctors in six altered laboratories all activated different, actual adult tests aggravating to acquisition HIV in this babyish and cipher was able to acquisition any.
"And so we absolutely can absolutely confidently achieve at this point that the adolescent does actual abundant arise to be cured."
A backer for the HIV/Aids alms the Terrence Higgins Trust said: "This is interesting, but the accommodating will charge accurate advancing aftereffect for us to accept the abiding implications for her and any abeyant for added babies built-in with HIV."
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