Corentin TROPEE, health and safety engineer working at the Institut Pasteur. In particular, I support scientists in improving their good working practices, in the design of premises and in their contacts with regulatory authorities. The end goal is that they can handle biological agents or hazardous chemicals efficiently and safely. A chemist by training, I am in constant contact with researchers from the Institut Pasteur who work in many fields of biology. It is in this context that I had the pleasure of participating in the MOOC Vaccinology as a learner in 2015 and of validating the knowledge acquired at the end of the course.