According to numerous reported studies, recombinant vaccines based on repli
cative versus non replicative adenoviruses appear to be attractive candidat
es for vaccination against animal and human diseases. They have proven thei
r ability to express high levels of heterologous genes and to induce humora
l and cellular immunity independently of the antigen, the animal model or t
he route of administration, Furthermore, these vectors induce an excellent
immunity upon application to mucosal membranes suggesting their usefulness
as vaccines against different infectious agents responsible for respiratory
and genital diseases.