It's the largest outbreak of human bird flu infections in U.S. history, and accounts for most of the 11 cases reported to date.

COLORADO, USA — U.S. health officials on Friday announced two more bird flu cases among farmworkers, but they also said a new study in Michigan suggested the virus is not causing silent ...

Meanwhile, two more infections tied to a Colorado poultry farm were reported, bringing the total to six. It’s the largest outbreak of human bird flu infections in U.S. history.

News Nation/World Two more bird flu cases reported in Colorado, but elsewhere a study finds no asymptomatic infections This 2005 electron microscope image shows an avian influenza A H5N1 virion.

NEW YORK – U.S. health officials on Friday announced two more bird flu cases among farmworkers, but they also said a new study in Michigan suggested the virus is not causing silent infections in ...

NEW YORK (AP) — U.S. health officials on Friday announced two more bird flu cases among farmworkers, but they also said a new study in Michigan suggested the virus is not causing silent ...

NEW YORK (AP) — U.S. health officials on Friday announced two more bird flu cases among farmworkers, but they also said a new study in Michigan suggested the virus is not causing silent ...