LOS ANGELES/CHICAGO (Reuters) – KFC, the world’s largest chain of fried chicken restaurants, may face pressure from consumer and environmental groups to change how its poultry are raised after McDonald’s Corp (MCD.N) said it would switch to chicken raised without human antibiotics. McDonald’s will phase out chicken raised with antibiotics that are important to human health over two years to allay concern that use of the drugs in meat production has exacerbated the rise of deadly “superbugs” that resist treatment, Reuters reported last week.