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. 2020 Feb;26(2):307–310. doi: 10.3201/eid2602.171636

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Phylogenetic tree of chikungunya viruses collected from patients in Pakistan, December 20, 2016–May 31, 2017 (red squares), and reference viruses. The tree was generated by the maximum-likelihood method based on the nucleotide sequence of the partial envelope 1 (A) and nonstructural protein 1 (B) genes. Red text indicates East/Central/South African genotype; yellow text indicates Asian genotype; green text indicates South African genotype; blue text indicates West African genotype; and purple text indicates o’nyong-nyong virus ancestral strain. GenBank accession numbers are provided for reference viruses. Scale bars indicate nucleotide substitutions per site.