SeV is a member of genus Respirovirus, members of which primarily infect mammals. Sendai virus (SeV), previously also known as murine parainfluenza virus type 1 or hemagglutinating virus of Japan (HVJ), is a negative sense, single-stranded RNA virus of the family Paramyxoviridae, a group of viruses featuring, notably, the genera Morbillivirus and Rubulavirus.