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.

Inoculation rates are seldom going to be 100% as there's very good reasons for some people to not get a vaccine (e.g. immune-compromised individuals), so there's always going to be some level of the virus circulating and that's assuming that the vaccine is 100% effective which seems unlikely.

Of course, the vaccination levels are far less than 100%, but typically enough to prevent the virus spreading too far - the problem now seems to be that vaccination rates in some areas are dropping below the level that prevents it spreading.

In case you did not get the memo, world is US and US is the world.

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".