 Prosecutors say Gao spent the money on luxury goods, including a New Jersey mansion, a Lamborghini sports car, and a yacht. Federal health officials are offering more details about the cluster of human cases of bird flu found in Colorado. There are now at least four confirmed infections in poultry workers there. More from NPR's Will Stone. The four positive results were found after about 60 people from the poultry farm were symptomatic and tested.