The H5N1 bird flu virus spreading among cows is infecting more farm workers than experts realized. The CDC tested 115 workers at farms suffering outbreaks and found eight of them tested positive for the virus - an infection rate of seven percent. Many of them had no symptoms, which officials fear indicates H5N1 is spreading much more widely than the official numbers show. Forty-six farm workers have been officially diagnosed with the virus but hundreds of cattle farms in dozens of states are experiencing outbreaks. The CDC is now recommending anyone exposed to infected animals get tested, not just those...