Early circulation of SARS-CoV-2, Congo, 2020 Bonguili, N. C. B. /Fritz, Matthieu Lenguiya, L. H. Mayengue, P. I. Koukouikila-Koussounda, F. Dossou-Yovo, L. R. Badzi, C. N. /Leroy, Eric Niama, F. R. To determine when severe acute respiratory syndrome coronavirus 2 arrived in Congo, we retrospectively antibody tested 937 blood samples collected during September 2019-February 2020. Seropositivity significantly increased from 1% in December 2019 to 5.3% in February 2020, before the first officially reported case in March 2020, suggesting unexpected early virus circulation. 2022 text https://www.documentation.ird.fr/hor/fdi:010084764 fdi:010084764 Bonguili N. C. B., Fritz Matthieu, Lenguiya L. H., Mayengue P. I., Koukouikila-Koussounda F., Dossou-Yovo L. R., Badzi C. N., Leroy Eric, Niama F. R.. Early circulation of SARS-CoV-2, Congo, 2020. 2022, 28 (4), 878-880 EN CONGO