After bird flu was found in a Georgia commercial poultry facility for the first time, a second and even larger flock nearby has tested positive for the virus.

The escalating bird flu crisis is ravaging the nation's supply of eggs, leading to increased prices and presenting an immediate challenge for the Trump administration. Why it matters: An outbreak of avian influenza is growing and has affected nearly 13 million birds in the last 30 days,

"The Chinese poultry lineage may have experienced more vaccine-driven selection compared to other lineages," the researchers wrote.