Immune cells take cue from animal kingdom: Together, everyone achieves more

Much like birds fly in flocks to conserve energy and ants create complex nests to protect their queens, immune cells engage in coordinated behavior to wipe out viruses like the flu. Scientists discovered that cells called neutrophils arrive at the site of injury within an hour of infection and leave a chemical 'trail' behind them. Killer immune cells called T cells use this trail to find the site of injury and destroy the invader.