> Only people who tested negative were allowed to the event. I can't confirm that. The BBC article doesn't mention testing at all, and Spiegel Online writes:

> Only people who tested negative were allowed to the event. I can't confirm that. The BBC article doesn't mention testing at all, and Spiegel Online writes: "Mitmachen darf jeder, der keine Vorerkrankungen der Lunge oder des Herzens hat und zwischen 18 und 50 Jahre alt ist." (Anyone with no prior illness of the lungs or heart and between 18 and 50 years of age is allowed to participate.) and "Alle Teilnehmer mussten zwei Tage vor dem Studientag einen Abstrich aus ihrem Rachen abliefern, der auf eine Corona-Infektion getestet wurde. Eine Probe war positiv." (All participants had to submit a throat swab two days prior, which was tested for Corona infection. One sample was positive.) The first part seems to refer to prior illnesses other than Covid, even though it doesn't specifically say so. The second part doesn't say that the positive sample was excluded from the concert. Reading between the lines, this whole experiment does indeed appear to test the spread of the actual virus.