Excess deaths...in 2018?

I was looking at charts of excess deaths on the CDC site, and noticed a spike in excess deaths in early 2018. I can’t think of why, but it seemed pretty uniform looking at some different states. Any ideas?

Flu? Maybe it was a year that the vaccine was a poor guess. Just a WAG, but early in the year suggests it.

There ya go. I wondered about the flu, but thought I’d remember something like that. Thanks!