The fusogenic reoviruses separate into subgroup II, containing the avian reovirus (ARV)-type species and the Nelson Bay virus (NBV) isolated from a flying fox, and subgroup III occupied by the baboon reovirus (BRV).

• 第二个亚群为融合基因正呼肠孤病毒 ,包括禽呼肠孤病毒 (ARV)和从飞狐 (flyingfox)分离到的内尔森海湾病毒 (NelsonBay) (NBV) ; 第三个亚群包括从狒狒体内分离到的呼肠孤病毒 (BRV)。