A technique that alters T cells has been shown to reduce the amount of virus in infected people. For the first time, researchers have shown that a cell-based therapy for HIV/AIDS can reduce the amount of virus in infected people. The breakthrough—big news for researchers, who have struggled for decades to create vaccines and cell-based therapies for HIV—was announced on Sunday at the 51st Interscience Conference on Antimicrobial Agents and Chemotherapy in Chicago. To date, the sole treatment for HIV has been multidrug regimens that prolong life but never eliminate the virus. Sangamo BioSciences of Richmond, California, says it has...