It’s normal for viruses, including SARS-CoV-2, to mutate. But is there a limit to how much the virus can mutate and still make people sick — or can the virus just continue to evolve indefinitely?

It’s normal for viruses, including SARS-CoV-2, to mutate. But is there a limit to how much the virus can mutate and still make people sick — or can the virus just continue to evolve indefinitely?