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Longitudinal SARS-CoV-2 antibody reactivity spike protein and RBD at study sites: Sotuba (top row), Bancoumana (middle row), and Donéguébougou (bottom row). Visit 1: 28 July–16 October 2020. Visit 2: 14 December 2020–29 January 2021. OD, optical density; RBD, receptor binding domain; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
