I guess the theory is if he has it she has it. He had worse symptoms and presented first. Of course that means she may never show up as a positive, but it's debatable how important that is right now. He's an AD at a good-sized HS, she's semi -retired and a part-time school nurse. He would've exposed many more people. I can understand the reasoning to assume if he's positive, she's positive, and let's save the test for a case that's more in doubt. Also they've been self-quarantined for about a week now.
If he gets the results back in a week, do they then both self quarantine for 2-3 more weeks? More?