Pas aussi clair que vous le laissez entendre Patricia...
Le lien mentionné dit ceci :
In settings where there is community or cluster transmission of SARS-CoV-2, irrespective of vaccination status or history of prior infection, wearing a well-fitting mask that covers the nose and mouth is recommended for the public when interacting with individuals who are not members of their household :
in indoor settings where ventilation is known to be poor or cannot be assessed, or the ventilation system is not properly maintained, regardless of whether physical distancing of at least 1 (...)