At the end of 2019, the new coronavirus (Sars-Cov-2) has spread fast, drawing attention to the global density of human and informational mobility networks. It has “associated” (Latour, 2020) — in very different ways, depending on the country, neighbourhood or household — with systems of detection, of care and control, but also with «essential» labour and commodity markets, or with relations, whether formal or familial, of exchange, of obligation and of care.