The objective is to demonstrate if there is no increase in the risk of Sars-Cov-2 salivary carriage 7 days after a concert in the group participating in the event compared to a non participating group who stayed at home. The hypothesis is that a systematic screening of Sars-Cov-2 within the 3 days before the event allows to control the risk of transmission and prevent cluster of transmission during the concert.
Before inclusion, the participants will be able to pre-register to the event via a website. They will get an appointment for an inclusion visit at the Accor Arena (Paris Bercy, France). During 3 days (from D-3 to D-1), participants with a registration will come to the Accor Arena to have a rapid Sars-Cov-2 antigen test (results in 15 min). If the test is positive, the participant will be contacted and managed by the medical team in charge of the national strategy for positives cases. People with a negative test will be included and randomized : * Two kits with tube for collecting saliva samples (for D0 and D7) will be given to each participant at this visit * People randomized in the experimental group will receive their concert ticket at a later date. * At Day 0, people randomized in the experimental group, will come to the Accor Arena with their ticket to participate in the concert. At the entrance, they should give their D0 saliva sampling kit. The people randomized in the control group will stay at home and will send their D0 saliva sample by post mail. * At Day 7 (±1 day) all the participants must return their D7 saliva sampling kit via post mail
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
6,678
People attending a concert in a closed area, with a mask
A nasopharyngeal swab at inclusion (up to 3 days before concert) to confirm eligibility
Saliva samples sent by participant at Day0 and Day7
AccorHotels Arena
Paris, France
Number of participants with a positive salivary RT-PCR at day 7 after the date of the concert
Prove the lack of increase of salivary carriage risk of SARS-CoV-2 on day 7 in participants present at the concert (experimental group) compared to non-participants at the event (control group)
Time frame: 7 days after the concert (-1/+8 days)
Number of participants in each group with a positive salivary RT-PCR the day of the concert
Evaluation of the salivary carriage on day 0 (the concert day) despite a negative test within 3 days before the event and the conversion rate of salivary carriage between D0 and D7
Time frame: The day of the concert
Molecular analysis of transmission clusters
Comparison of the sequence of complete viral genome in participant with a positive test at day 7
Time frame: 7 days after the concert (-1/+8 days)
Average percentage of participants wearing their mask adequately for the duration of event
Estimate the overall compliance of the mask wearing by the participants during the duration of the event (covering nose and mouth)
Time frame: The day of the concert
Percentage of adequate mask wearing among participants according to location and time
Identify the circumstances (place, time) of failure of accurate mask wearing by the participants
Time frame: The day of the concert
Percentage of participants who downloaded and / or used the TousAntiCovid application at the time of inclusion
Estimate the feasibility and acceptability of using the Tousanticovid application
Time frame: The day of the concert
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