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You're listening to Today Explained.

So we are speaking early Monday morning.

Yesterday, the passengers that were on board the cruise ship that got hit by hantavirus, they got off the ship.

And what happened next?

What has been happening in the meantime with those people?

All right, so 42 days of confinement, that is a long time, and it suggests that what we're dealing with here is something that is kind of serious.

What is hantavirus?

OK, so how did the Andy's version of hantavirus get on this cruise ship?

What do we know?

What's happening right now is very real for all of us here.

How does a person get this?

Like, what are the symptoms and then how are they passed?

Oh, that's interesting.