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.

At each end, the CNIO researchers, María Currás and Bruna Calsina. Between them, Juana María Cano, from the University General Hospital in Ciudad Real, and Rafael Morales, from the University Hospital ...