How H5N1 Went from an Illness in Wild Birds to a Global Pandemic Threat
The first hints that a new strain of avian illness is emerging could be found on this beach on Delaware Bay, where migrating birds flock. Here’s what virus detectives who return there every year know right now.

The first hints that a new strain of avian illness is emerging could be found on this beach on Delaware Bay, where migrating birds flock. Here’s what virus detectives who return there every year know right now.