Just to add to what the president said, obviously the front line of all the health facilities is a very critical point for assessment. Based on what all the provinces and territories are doing, they have a very low threshold at the moment for looking for anyone, not just from Hubei province, but from all over China, and they have the flexibility and physicians to test anyone they suspect might have the coronavirus. It's through that specific history, like “Have you been in a hospital?” or “Have you contacted someone with pneumonia?”, and they have a very low threshold right now for testing.
So far, though, all the positive cases have a link back to Wuhan.