Figure 5From: Spatial, temporal and genetic dynamics of highly pathogenic avian influenza A (H5N1) virus in ChinaDistribution of prevailing H5N1 virus clades in China. (a) Clade 0; (b) clade 2.3.2; (c) clade 2.3.4; (d) clade 7. Thin black line represents latitude of Yangtze River. Circle size is proportional to sample size, with smallest circle representing one sample, and largest 18 samples.Back to article page