Introduction into Nigeria of a Distinct Genotype of Avian Influenza Virus (H5N1)
Alice Fusaro, Tony Joannis, Isabella Monne, Annalisa Salviato, Bitrus Yakubu, Clement Meseko, Tinuke Oladokun, Sonia Fassina, Ilaria Capua, and Giovanni Cattoli
Author affiliations: Istituto Zooprofilattico Sperimentale delle Venezie, Padova, Italy (A. Fusaro, I. Monne, A. Salviato, S. Fassina, I. Capua, G. Cattoli); National Veterinary Research Institute, Vom, Nigeria (T. Joannis, B. Yakubu, C. Meseko, T. Oladokun)
Figure 1. Phylogenetic tree constructed by Bayesian analysis of the hemagglutinin gene segment of representative influenza viruses A (H5N1) from Africa, Europe, and the Middle East. Taxon names of the Nigerian viruses isolated during 2006–2007 are marked in blue, 2008 isolates in red. Posterior probabilities of the clades are indicated above the nodes. Scale bar indicates number of nucleotide substitutions per site.
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