US investigating potential human-to-human bird flu transmission – Medical Xpress

US investigating potential human-to-human bird flu transmission  Medical XpressScientists race to investigate possible human transmission of H5N1 in US outbreak  The TelegraphFour more US health workers show symptoms after contact with Missouri bird flu patient  ReutersMissouri investigates more possible human-to-human H5N1 avian flu spread  University of Minnesota Twin CitiesPossible Cluster of Human Bird-Flu Infections Expands in Missouri  The New York Times