In accordance with the CERN Staff Rules and Regulations, your social insurance cover is the responsability of your employer or of the educational institution at which you are normally enrolled.
If you do not have this kind of insurance covering you in both Switzerland and France, you are under the strict obligation to take the necessary measures to safeguard yourself against the economic consequences of illness, accidents and disability throughout your stay at CERN. This obligation also applies to any family members who may be accompanying you.
Owing to the geographical position of the Organization on the border between France and Switzerland, we strongly recommend that you enquire at the relevant consulates to find out the conditions of admission applicable to you in Switzerland and in France, specifying the duration of your visit at CERN. If necessary, you are kindly asked to take the necessary steps to obtain the papers required, in particular Swiss and/or French multiple-entry visas. Please consult the proper official web sites.
If you require an invitation letter for a visa, please contact email@example.com