Figure 1. Epidemiology of avian influenza in different poultry farming sectors (Sources: Analysed data from different authors [8,39,40,41,42,43])

From

Review on Biosecurity in Extensive Poultry Production in Developing Countries with Respect to Highly Pathogenic Avian Influenza

Salimata Pousga, Ulf Magnusson, Hamidou Boly, Georges Anicet Ouedraogo

American Journal of Rural Development. 2018, 6(3), 71-78 doi:10.12691/ajrd-6-3-2