Israel has a border.
Does New York have a border? Remember when they were restricting New York travelers in Florida and Texas because they were still traveling during the height of the disease in the city?
Can an infected person from Chicago go to Israel? (I’m assuming its a no). Can they go to New York? Most definitely. And they can fly there too!
Subways? Do what the rest of the world does, clean them. Lower the passnger load. Even the 3rd world can do that.