The COVID-SRLF study will evaluate the sanitary safety of the French Intensive Care Society (FICS) annual meeting held in Paris Congress Center from June 9th to June 11th 2021 in the Coronavirus Disease 2019 (COVID-2019) pandemic situation. The primary objective is to determine the proportion of attendees with a positive antigenic COVID-19 screening test at day 7 (+/- 1) of their participation to the meeting. This rate will be compared to a cohort of health care professionals (medical doctors and paramedical professionals) from the same hospital ward as the attendees but who did not attend the meeting (stratified on centers, gender, age (< and >= 40 years, vaccination status (0, 1 or 2 doses) and socio-professional status (medical doctor, nurse, nurse assistant).

Inclusion Criteria:

• Healthcare professional healthy volunteer
• Absence of COVID-19 symptoms in the 2 weeks prior to inclusion
• Not being a COVID-19 contact case in the 2 weeks prior to inclusion
• Participation to at least one day of the FICS annual meeting (June 9-11 2021)

Exclusion Criteria:

• Non-healthcare professional (exhibitors, congress center employees)
• Refusal to participate to the study
• Person under legal protection
• Absence of social security affiliation

Two cohorts of healthy volunteers will be followed during 21 days after the French Intensive Care Society annual meeting. A first cohort, Conference Attendees cohort, constituted of volunteering healthcare practitioners (medical doctor, nurse, nurse assistant, physiotherapist and psychotherapist) attending the FICS annual congress. The second cohort, Control cohort, will gather volunteering healthcare practitioners (medical doctor, nurse, nurse assistant, physiotherapist and psychotherapist) who dit not attend the FICS annual congress, recruited in the same medical departments as the Conference Attendees participants.