Second, they had indeed taken into account college partying and quite a bit of it — more than 7,000 students partying three times a week in their model.
What the scientists had not taken into account was that some students would continue partying after they received a positive test result. “It was willful noncompliance by a small group of people,” Dr. Goldenfeld said.
Those were the key ingredients for a few people infecting many others. “If you know you are positive,” Dr. Elbanna said, “and you go to a party, that’s not just a bad act. That’s very, very dangerous.”
Some of the students who tested positive even tried to circumvent the app so that they could enter buildings instead of staying isolated in their rooms, university administrators said in a letter to students.