Was Missouri’s bird flu case a one-off or something more? Quest for answers faces testing delay STATMissouri investigates more possible human-to-human H5N1 avian flu spread University of Minnesota Twin CitiesScientists race to investigate possible human transmission of H5N1 in US outbreak The TelegraphThe Bird-Flu President The AtlanticPossible Cluster of Human Bird-Flu Infections Expands in Missouri The New York Times