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Phylogenetic tree of DENV partial polyprotein gene sequences at capsid pre-membrane junction region (CprM). DENV-1 strains detected during the 2019 outbreak in Tanzania are indicated in black squares. The evolutionary relationship was inferred by the Maximum likelihood method in 1000 bootstrap replicates. The bootstrap support values >80% are shown at the nodes. The scale bar indicates nucleotide substitutions per site
