Syncytin-1, an endogenous retroviral envelop (env) protein, was found to be packaged in a significantly higher amount at 72 h in EVs after viral infection (* p = 0.02) from the densitometric analysis of dot blot of syncytin-1 expression via Bio-Rad imaging program and GraphPad software (Figure 3D). This evidence concerns the gene ERVW-1 and viral infectious disease.