Outbreaks in pigs are also known to have occurred in North and South America, Europe (including the UK, Sweden, and Italy), Africa (Kenya), and in parts of eastern Asia including China and Japan.

• 该病在猪群中的暴发曾发生于北美和南美，欧洲（包括英国、瑞典和意大利），非洲（肯尼亚），东亚部份地区（包括中国和日本）。