 The strain BB1 was given to the researchers of Institute of Viral Disease Control and Prevention, Beijing, China by researchers of Ivanovsky Institute of Virology, Moscow, Russia in 1960s.Another strain is Tianjin strain, isolated in China in 2008.One of these strains was used for creation of replication deficient SeV85AB construct that is lacking fusion protein (F) but has inserted sequence encoding immunodominant antigen of Mycobacterium tuberculosis.