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Phylogenetic tree for partial chikungunya virus (CHIKV) nonstructural protein 1 gene nucleotide sequences. The phylogenetic analysis used 36 reference strains and one outgroup (O’nyong-nyong virus) and constructed by using the neighbor-joining method. All sequences labeled by Genbank accession number/country/year of isolation. The black arrow represents the CHIKV strain detected in this study.
