Fig. 2. : phylogenetic analysis based on partial E gene nucleic acid sequence (nt 1655-1984 according to AY632535) of a 2015 Brazilian strain of Zika virus. The tree was inferred using the maximum likelihood algorithm based on the Kimura two-parameter model with invariant sites as implemented in MEGA 6.05. The numbers shown to the left of the nodes represent bootstrap support values > 70 (1,000 replicates). The tree was rooted with Spondoweni virus and branch lengths do not represent genetic distance. Strains were labelled according to GenBank accession /country 2-letter acronym/year of isolation.