Vaccine disinformation is part of an attack. We've been subjected to five years of vaccine disinformation by a foreign power.
The US maintains 93% immunity for measles, and ~0% immunity for smallpox.
The potential impact of the attack is: the number of susceptible people, times one minus the R_0 (minus the immunized fraction), times the case fatality rate.
You still haven't gotten the one vaccine that is gonna matter.
Almost nobody has.