First U.S. H5N1 Death Sparks Urgency: Scientists Warn That Bird Flu Is Mutating Faster Than Expected SciTechDailyBird Flu Is Raising Red Flags Among Health Officials Johns Hopkins Bloomberg School of Public HealthHealth Alert Network (HAN) - 00520 | Accelerated Subtyping of Influenza A in Hospitalized Patients CDCAge of the panzootic: scientists warn of more devastating diseases jumping between species The GuardianVideo CDC urges hospitals to fast-track bird flu tests ABC News