Seroprevalence of anti-SARS-CoV-2 antibodies after the first wave of the COVID-19 pandemic in a vulnerable population in France: a cross-sectional study.

Objectives: We aimed to assess the level of prior SARS-CoV-2 infection in socially deprived neighbourhoods after the first wave of the pandemic, and to identify factors associated with seropositivity.

Design: A cross-sectional study.

Setting: Three socially deprived neighbourhoods of the city of Perpignan, in the south of France, where large settled Roma communities live.