Emergence and transmission dynamics of the FY.4 Omicron variant in Kenya. - Musundi S; Mwanga M; Lambisia A; Morobe JM; Murunga N; Moraa E; Ndwiga L; Cheruiyot R; Musyoki J; Mutunga M; Guzman-Rincon LM; Sande C; et al. (Virus evolution, 2025)