Evolutionary history and transmission dynamics of dengue virus type 2 in Africa
Mustapha Umar Imam
IntroductionDengue virus serotype 2 (DENV-2) is a major driver of severe dengue outbreaks globally, yet its evolutionary history and transmission dynamics across Africa remain incompletely understood.MethodsTo clarify its origins, introduction pathways, and patterns of regional spread, we compiled all available full-length DENV-2 genomes up to 16 July 2025, prioritizing African sequences while retaining representative global references. After quality filtering and down-sampling, a final dataset