Have you ever wondered why you have to get a flu shot every year, but some vaccines are one-and-done? It all has to do with how and how fast viruses evolve - and that depends on mutation rates.

Pilar Pérez Romero is affiliated with the spin-off company Vaxdyn SL as a founding partner. Lee Rafuse Haines does not work for, consult, own shares in or receive funding from any company or ...