SARS-CoV-2 antibody prevalence in Sierra Leone, March 2021: a cross-sectional, nationally representative, age-stratified serosurvey by Tushar Singh, Eugene T Richardson, Raphael Frankfurter, Rashid Ansumana, Sulaiman Lakoh, Curtis Blanton, Osman Sankoh, Mohamed Vandi, Mohamed Samai, Mohamed Bailor Barrie, J Daniel Kelly, Joseph Sam Kanu, James Sylvester Squire, Zikan Koroma, Silleh Bah, Abdulai Brima, Sarah A Goldberg, Smit Chitre, Chidinma Osuagwu, Justin Maeda, Bernard Barekye, Tamuno-Wari Numbere, Mohammed Abdulaziz, Anthony Mounts

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