In the absence of a person or structure forming the regional vigilance and support network in a region, the Director General of the regional health agency will contact the equivalent person or structure in the region that is the capital of the defence and security zone or, failing that, in another region, and will invite them to join the regional vigilance and support network in their area of responsibility. It informs the Director General of the regional health agency for the zone or the Director General of the regional health agency for the area in which the person or structure requested is competent.