The Institut Pasteur (Paris) and the Institut Pasteur International Network have been extremely active worldwide in responding with science to the pandemic caused by the SARS-CoV-2 coronavirus. This virus is responsible for the new infectious respiratory disease called Covid-19 (for CoronaVIrus Disease). This mobilization brings together hundreds of people from the Institut Pasteur in Paris and several teams from the Network in many countries. A coronavirus task force was set up by the Institut Pasteur in January to launch and coordinate new Covid-19 research projects. Other projects are carried out in partnership or with the support of third-party organizations.