Subsequently, cells transfected with an empty vector as a control or STLV-1 Env (Si-2 strain) were mock-infected or infected with G-complemented VSVΔG-JmGL-AcGFP or VSVΔG-AcGFP at an MOI of 1, and the numbers of viable cells were then counted at the indicated days after infection. The gene discussed is ERVW-1; the disease is infection.