O'nyong-nyong Virus, Chad
Figure 2. Phylogenetic tree of O'nyong-nyong virus (ONNV) based on partial E1 nucleotide sequence. Phylogram was constructed with MEGA 2 program (http://megasoftware.net/mega2.html) and tree drawing used the Juke-Cantor algorithm for genetic distance determination and the neighbor joining method. The percentage of successful bootstrap replicates (1,000 bootstrap replications, confidence probability >90%) is indicated at nodes. The length of the branches is proportional to the number of nucleotide changes (% of divergence). CHIKV (Chikungunya virus), SFV (Semliki Forest virus), MAYV (Mayaro virus), and SINV (Sindbis virus) sequences have been introduced for correct rooting of the tree.