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Geographic region and host distribution of ALV-J viruses during 1988–2020. Geographic region distribution of ALV-J virus in the world (A) and in China (B). Host distribution in 7 different regions of China (C). W: White-chickens; L: layers; Y: Yellow-chickens; N: unrecorded breeds; 817: a crossbred meat-type chicken; WB: wild birds; G: gamecock; V: contaminated live vaccines.
