I'm not sure that being an island the main factor. The underlying factor is connectivity. Some islands have low connectivity while others do not -- being an isl

I'm not sure that being an island the main factor. The underlying factor is connectivity. Some islands have low connectivity while others do not -- being an island isn't, in itself, protective. If you think about it, most countries in the world only have limited ports of entry (no matter the size of the border), and if a national government shuts off these ports of entry, the country essentially becomes an "island" whether they have a surrounding body of water or not. (assuming strong borders and no illegal traversals -- which may or may not be good assumptions depending on where you are, but it's a simplifying assumption for the sake of discussion). Montreal is an island but its COVID rates are far worse than Toronto. There's nothing special about being an island. It's about the connectivity.