SARS-CoV-2 seroprevalence in three Kenyan health and demographic surveillance sites, December 2020-May 2021 by Etyang, AO, Adetifa, I, Omore, R, Misore, T, Ziraba, AK, Ng'oda, MA, Gitau, E, Gitonga, J, Mugo, D, Kutima, B, Karanja, H, Toroitich, M, Nyagwange, J, Tuju, J, Wanjiku, P, Aman, R, Amoth, P, Mwangangi, M, Kasera, K, Ng'ang'a, W, Akech, D, Sigilai, A, Karia, B, Karani, A, Voller, S, Agoti, CN, Ochola-Oyier, LI, Otiende, M, Bottomley, C, Nyaguara, A, Uyoga, S, Gallagher, K, Kagucia, EW, Onyango, D, Tsofa, B, Mwangangi, J, Maitha, E, Barasa, E, Bejon, P, Warimwe, GM, Scott, JAG, Agweyu, A