The USA fatality share has held around 4.5 since I started checking a couple years ago. For reference, default deviation is 0, meaning Sf=1. So 4.5 means that we lost four and a half times as many people as the global average for population. How/why is for various experts to sort out, but those are the numbers.
If you wonder how that's possible, just listen to how typical Mur'c'ns respond to being told they're too sick to go out and play with the other kids.
https://www.npr.org/2026/05/21/nx-s1-5827015/american-passenger-order-hantavirus-quarantine