Scientists in Germany have held three pop concerts in a single day to investigate the risks posed by mass indoor events during the pandemic.
About 1,500 healthy volunteers aged between 18 and 50 - only a third of the expected number - took part.
But the head of the study, which was carried out in Leipzig by Halle University, said he was "very satisfied" with how the event unfolded.
Singer-songwriter Tim Bendzko agreed to perform at all three successive gigs.
The study came as Germany recorded its highest number of Covid-19 infections since the end of April.
More than 2,000 cases were recorded in the last 24 hours, bringing the total number of cases to 232,082, the Robert Koch Institute reported.
