Will bird flu be the next pandemic? Vaccines are prepped, just in case.

HOLLY SPRINGS, N.C. ‒ A quiet effort to prevent the next global pandemic began rolling off an assembly line this summer behind the gates of an office complex in suburban Raleigh. In this sprawling factory, sheltered by thick pine groves, workers at CSL Seqirus are bottling millions of doses of a new vaccine targeting the H5N1 bird flu virus.