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A maximum likelihood tree constructed based on the partial envelope (E1) gene sequence of CHIKV. Each CHIKV isolate is shown together with its country of origin followed by two digits, which indicate the year in which it was isolated and its GenBank accession number. Three representative strains that were isolated in the present study are indicated by filled triangles. Bootstrap values of <60 % are not shown. The scale bar indicates the mean number of nucleotide substitutions per site
