 There's a new warning from the CDC on a listeria outbreak tied to meat sliced at deli counters. Investigators are collecting information to determine the specific products that may be contaminated. Listeria is most likely to sicken those who are over 65, pregnant, or with weakened immune systems. Health officials advise heating deli meats to steaming hot and then letting them cool before eating. That's ABC's Chuck Severson. There have been 28 cases in 12 states and two deaths.