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Each of the four serotypes of mosquito‐borne dengue virus (DENV‐1‐4) comprises multiple, genetically distinct strains. Competitive displacement between strains within a serotype is a common feature of DENV epidemiology and can trigger outbreaks of dengue disease. We investigated the mechanisms underlying two sequential displacements by DENV‐3 strains in Sri Lanka that each coincided with abrupt increases...