

To achieve the status of measles elimination, a country must have no ongoing local transmission of the disease for at least one year. It will lose that status if it has a chain of cases that spread from person to person for more than one year.
We’ve been heading in that direction, but we won’t have officially lost our measles-free status until the current outbreak has continued for a full year.

According to Grok, the threshold is 50% of humanity. Apparently Elon Musk dying is as bad as or worse for humanity than a Thanos snap.