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Spatial Distribution and Risk Factors of Highly Pathogenic Avian Influenza (HPAI) H5N1 in China

Figure 2

Relationship between risk factors and HPAI H5N1 risk function.

The HPAI H5N1 risk functions of the BRT models is plotted as a function of chicken density (ChDnLg, log10 scale), domestic waterfowl density (DuGeDnLg, log10 scale), human population density (HpDnLg, log10 scale), elevation (DemLg, log10 scale), and percentage of land covered by water (WaPc) based on HPAI H5N1 clinical disease outbreak (five first plots) and HPAIV H5N1 risk-based surveillance data (five last plots). The grey lines present the predicted line for each bootstrap, and the black line is the average across all bootstraps.

Figure 2

doi: https://doi.org/10.1371/journal.ppat.1001308.g002