"What this trial is telling us is that it is now time to look at the possibilities - from prevention and treatment to even cure," he said.
Commenting on the findings, Prof Vincent Piguet from Cardiff University, said: "This exciting novel study shows for the first time that antibodies may have a place in the line of therapies directed against HIV."
He described it as an "important development in the fight against HIV" but said the costs of antibody therapy and the emergence of resistance must be taken into account.