A transplant patient contracted AIDS from the kidney of a living donor, in the first documented case of its kind in the U.S. since screening for HIV began in the mid-1980s. It turns out the donor had unprotected gay sex in the 11 weeks between the time he tested negative and the time the surgery took place in 2009. In a report Thursday on the New York City case, the Centers for Disease Control and Prevention recommended that organ donors have repeat HIV tests a week before surgery. "The most sensitive test needs to be done as close as possible...