USC University Hospital halted kidney transplants last month after a kidney was accidentally transplanted into the wrong patient, according to a spokesman for the program that coordinates organ transplants in Los Angeles. The patient who received the wrong kidney escaped harm, apparently because the kidney happened to be an acceptable match, said Bryan Stewart, spokesman for the program, OneLegacy, which was notified of the error by the hospital. The hospital, which performs about two transplants a week, confirmed in a statement that it had voluntarily halted transplants Jan. 29 after a "process error" was discovered. The hospital did not detail the nature of the error and declined to answer questions. It said no patients were harmed.