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Volume 12, Number 8—August 2006


O'nyong-nyong Virus, Chad

Maël Bessaud*, Christophe N. Peyrefitte*, Boris A.M. Pastorino*, Patrick Gravier*, Fabienne Tock*, Fabrice Boete†, Hugues J. Tolou*, and Marc Grandadam*Comments to Author 
Author affiliations: *Institut de médecine tropicale du Service de santé des armées, Marseille, France; †Cabinet médical d'unité, Commercy, France

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Figure 2

Figure 2. Phylogenetic tree of O'nyong-nyong virus (ONNV) based on partial E1 nucleotide sequence. Phylogram was constructed with MEGA 2 program ( 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.

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