Based on theoretical and methodological approaches from anthropology and sociology, and through an analytical framework borrowing from political science, this interdisciplinary research project proposes to analyze the effects of COVID-19 on populations living in poverty squats. Our objective is to document the practices put in place by the occupants of these illegal places (collective or family) during the pandemic period to protect themselves and others from contamination and to understand the differential, multifaceted and diachronic health measures among this poor and mainly migrant population. The main purpose of this fieldwork will be 1) to trace the care trajectories of infected people or "contact cases" during the different stages of the health emergency (first confinement, curfew period, second confinement) and to analyze how the forms taken by health socialization during this period were in continuity with previous practices or got reorganized, 2) to better understand the role of public authorities, humanitarian associations and activist groups in the support and socio-health care of these populations living in squats (transmission of medical information, establishment of health protocols, management of cases of contamination, etc.). It is important to conduct this investigation while the epidemic is still active, in order to collect reliable and precise data through observations and interviews. This investigation will also examine discourse and practices around vaccination and its accessibility for eligible people living in these places.