The only HIV vaccine to show promising efficacy in clinical trials stimulated an antibody-based defense in some individuals but not in others....The results of this latest analysis were published July 15 in Science Translational Medicine....“Understanding why [the vaccine] appeared to work in some individuals and may not have worked in others is really paramount to moving the field closer to an effective [HIV] vaccine,” said Bruce Walker, director at the Ragon Institute of Massachusetts General Hospital, MIT, and Harvard.