| abstract |
The present invention relates to a mutant strain of Sarcocystidae in which the function of at least one virulence-essential protein is suppressed, characterized in that it contains at least one nucleic acid coding for at least one immunogenic heterologous antigen and the necessary means, respectively. to its expression, provided that when said mutant strain contains a nucleic acid encoding an immunogenic heterologous antigen, said mutant strain lacks a selection gene, said at least one immunogenic heterologous antigen being an immunogenic heterologous antigen of virus, parasite or of bacteria. |