The Q code in Shanghai has the technology to know if someone tested positive for the virus or was on public transportation or at a store or at a party or gathering with someone who was infectious in the past two weeks. Those green codes allow
Disneyland there to be pretty sure they aren’t letting in people who are infectious. They can be more confident to open shows.
We don’t have that kind of tracking here. I am sure if there are still cases in the part of the public population that is allowed to travel to DisneyWorld there will be infectious people in the parks.