It's their job to know all of it as quickly as possible. Also, scientists *claim* that people aren't contagious until they show symptoms, so hopefully this dude wasn't too contagious for too long before getting to the hospital. But you can bet the CDC knows his every movement (um, literally) from the moment he set down. If Nigeria can control Ebola, I'm thinking we can. Scary though. I'm sure TV news is reporting very responsibly on it. I wouldn't know.
can only be transmitted when symptoms occur so he couldn't have spread it on the plane since he was feeling fine then.