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Re:No one who got Moderna's vaccine in trial developed sever... by alisonkisk on Monday November 30, 2020 @02:43PM (#25258012)
They don't fullly know. They rely on statistics.

I hope they at least ask subjects about exposure.

Re:No one who got Moderna's vaccine in trial developed sever... by justinc8687 on Monday November 30, 2020 @09:09PM (#25261502)
I'm in the AZD1222 (AstraZeneca) trial, and for the next two years, I need to fill out an online symptom questionnaire every single week. They also draw blood at the 6-month and 1-year mark, so presumably could test for antibodies.
Re:No one who got Moderna's vaccine in trial developed sever... by nradov on Monday November 30, 2020 @03:01PM (#25258215)
Subject reports of exposure are notoriously unreliable. People forget. And even when anonymity is guaranteed they lie about shameful behavior.