Spatial diffusion and host transmission of the ALV-J Clades 1.1, 1.2, 1.3 and 2 viruses. Spatial diffusion pathways and histograms of total number of state transitions (A, B, E, F, I, J, M and N); Host transmission pathways and histograms of total number of state transitions (C, D, G, H, K, L, O and P). Green arrows, supported rates with 3 ≤ BF < 10; blue arrows, strongly supported rates with 10 ≤ BF < 100; purple arrows, very strongly supported rates with 100 ≤ BF < 1,000 and red arrows, decisive rates with BF ≥ 1,000. W: White-chickens; L: layers; Y: Yellow-chickens; WB: wild bird; 817: a crossbred meat-type chicken; N: unrecorded breeds.