1
Nto the viral backbone (Table 1). Viral vaccine vector systems, such asNto the viral backbone (Table 1). Viral vaccine vector systems, such as adenovirus (type 2 and 5), adeno-associated virus, retrovirus, lentivirus, poxvirus, alphavirus, herpes simplex virus (HSV), offer several potential advantages over traditional vaccines, even though [23,24] each of them show some limitations and side