The news just broke last night. The AP said they were contact tracing and appropriate steps would be taken to isolate those exposed. I've been waiting for the update but haven't found exactly what they decided to do yet (who, if any one, they will isolate and how long)...seems like this took them by surprise and are still waiting to hear re guidance from authorities and the cruise line. There's a reporter from the Times on the cruise live tweeting on it, but she has nothing on it yet.
It's all very strange. Why not, if you are going to insist on both, have them present a test within 48 hours before boarding and rapid test them when they get on....why was there testing done at the boarding site, when you know a positive result could come back 24 hours later. Or did the couple get tested on ship for some reason? Odd. The reporting isn't clear.
Oh but the positive couple have been definitely put in an isolation cabin according to the Times reporter from this am. She doesn't say for how long.