World may be 'post-herd immunity' to measles, top US scientist says

I'd appreciate understanding why, when inoculation rates outside of the USA are holding up: how does this happen? Is there enough infection flow to China and Europe? I would have thought the evidence is that infection flows inbound to America mostly.

I did just see a meme that compared the numbers of kids with measles in Texas to the number of trans college athletes along with "Guess which one they want you to focus on".