Figure 2

Power law distributions of the cumulative number of A(H5N1) hemagglutinin genes sequenced in Asian and African countries and reported to influenza surveillance networks between 2003 and 2011 (data shown in Figure 1) The 36 countries were ranked by the number of reported gene sequences to the influenza surveillance network and plotted against the total number of sequences. A) The data was fit to a nonlinear power law regression and the coefficients were estimated. B) Log-Log plot (same dataset) showing a linear regression. C) Kolmogorov-Smirnov test for goodness-of-fit to power law distributions derived from data variability using the lower, middle (median), and upper quartiles.