Fig. 5.

Genotypes of H5N1 influenza viruses in southern China, 1996–2006. The eight gene segments, represented by horizontal bars are, from top to bottom, PB2, PB1, PA, HA, NP, NA, M and NS. Each different color represents a distinct phylogenetic lineage. Genotype definitions are described in the results section. Only persistent genotypes that were detected for more than two years are represented. Numbers of transient genotypes detected in only one year is given in boxed text. All detected genotypes are given in Figure S1 and a representative virus for each genotype in each year is listed in Table S1.