Whenever the CDC did their 180 and asked people to put their masks back on after saying vaxxed didn't need them, about a month before that because the CDC is always slow to do anything. Whenever that was. Still keeps people out of hospitals and alive. All it's good for anymore, but that's pretty good still.
I honestly expected them to wait on a travel ban with this new crud until we got a case in the US, and then several, where they could do a study to document community spread occurring, THEN they would do a travel ban. Kinda surprised they jumped so soon.