claim: coronavirus mutation may have made it less contagious.
evidence_1: but the mutation appears to have made the pandemic spread further and faster than it would have without it.", "patients with that strain of coronavirus carried more virus particles than other people, meaning they were probably more infectious, the study found.", "but one mutation near the beginning of the pandemic did make a difference, multiple new findings suggest, helping the virus spread more easily from person to person and making the pandemic harder to stop.")