part of viral process fusion of viral membrane with host outer nuclear membrane bf 2013-11-06T15:07:46Z GO:0039700 Fusion of a viral primary envelope with the host outer nuclear membrane during nuclear egress. The transitory primary envelope is acquired by the virus as it buds at the inner nuclear membrane and gains access to the perinuclear space. This membrane is lost by fusing with the host outer nuclear membrane during nuclear exit. fusion of viral membrane with host outer nuclear membrane involved in nuclear egress viral primary envelope fusion with host outer nuclear membrane biological_process exit of virus from host cell nucleus by nuclear egress