[Aids and Covid-19, two emblematic diseases of global health].

While the concept of "Global Health" has existed since the late 1990s, it is now part of the everyday language of international public health experts, but how can this approach be characterized? Because they transcend borders, because they call for collective and coordinated actions at the global level, and because they require a tripartite approach (multidisciplinary, multi-actor and multisectoral), the AIDS and Covid-19 epidemics illustrate perfectly, each in its own way, this new approach. The fight against AIDS can be considered, in a way, as a laboratory for global health. By provoking, along with others, the reorganization of the international health aid architecture, by stimulating the emergence of new actors on the international scene, and by contributing to the breakdown of borders and disciplines, AIDS has certainly accelerated this new way of thinking about health issues. The Covid-19 crisis is converting the try and forcing the international community to become aware of this new imperative: we have no other choice than global health, cooperation and solidarity on a global scale.