Screening for SARS-CoV-2 Antigen Before a Live Indoor Music Concert: An Observational Study

Prevention of SARS-CoV-2 transmission during a large, live, indoor gathering (SPRING): a non-inferiority, randomised, controlled trial

“…Those authors' observational study, on 5000 attendees under the same hygiene procedures on March 27, 2021, had an observed 0·13% incidence rate among attendees (six positive among 4584 within the 2 weeks post-gathering) similar to the background population based on public health records. 13 That result confirmed their randomised controlled trial outcome on a real-life number of attendees but the observational design precluded drawing definitive conclusions.…”

“…Several experiments in Germany, the Netherlands, the UK, and Spain, tried to define optimal interventions to prevent SARS-CoV-2 spread during events without physical distancing. 12 , 13 , 14 Most were observational, except one randomised controlled trial during an indoor live concert held in Barcelona, Spain, in December, 2020; 12 the concert included only half (n=465) the normal participants who underwent same-day rapid antigen diagnostic tests (RADTs) and wore N95 masks, which are impractical constraints for large gatherings.…”

Association between two mass-gathering outdoor events and incidence of SARS-CoV-2 infections during the fifth wave of COVID-19 in north-east Spain: A population-based control-matched analysis

“…4 , 5 , 6 , 7 When applied adequately, these preventive measures have shown the potential capacity to prevent SARS-CoV-2 spread, even in mass-gathering indoor events in a pre-vaccination scenario. 8 , 9 , 10…”

Practical measures for SARS-CoV-2 infection prevention – Authors' reply

“…We have used the same protocol of measures in a second non-randomised study with 4992 participants. 2 Using data from the centralised epidemiological surveillance system from the Catalan Public Health Department, we confirmed that there were no excess COVID-19 cases diagnosed during the subsequent 14 days after the indoor concert among concert attendees.…”