Tracking the U.S. bird flu outbreak has been hard. It’s about to get harder STATExclusive: Emails Reveal How Health Departments Struggle To Track Human Cases of Bird Flu Kaiser Health NewsInside the Bungled Bird Flu Response, Where Profits Collide With Public Health Vanity FairCalifornia Farms Are Roiled by 40% of US Bird Flu Cases in Cows BloombergHuman case of bird flu confirmed in Merced County, health officials say Merced Sun-Star