From birds, to cattle, to … us? Could bird flu be the next pandemic?

As bird flu is confirmed in 33 cattle herds across eight US states, Ian Sample talks to virologist Dr Ed Hutchinson of Glasgow University about why this development has taken scientists by surprise, and how prepared we are for the possibility it might start spreading among humans. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>