Scientists are particularly exposed in the current health crisis, where governments are using their advice to consolidate their decisions. Thus summoned as experts, also by the media, they find themselves both placed in collective responsibility, as is the case with the scientific council mobilised around the French government, and exposed individually. They also constitute a reference point, to which one can refer in order to gradually build up, as a citizen, an understanding of the situation. The role of science within society and in relation to the major political decisions that have to be made is thus extremely active, in various configurations, and subject to multiple pressures.