David Greene:
When we have a student who comes in, travels to campus, tests negative at first because the student was infected just before coming to campus, a couple of days later, tests positive, his roommate becomes infected.
We're able to, by contact tracing, know everybody he's been in contact with over the last few days. He's the only person, in this case, who was infected, because we were able to isolate him quickly, quarantine others.
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