| abstract |
The invention discloses a duck interleukin-2 for immune enhancement and its application as an immune enhancer. The duck interleukin-2 protein is the following (a1) or (a2): (a1) a protein composed of amino acid residues shown in sequence 1 in the sequence listing; (a2) (a1) is passed through one or several A protein derived from (a1) with substitution and/or deletion/or addition of amino acid residues and having immunoenhanced duck interleukin function. The recombinant interleukin-2 product provided by the present invention is a high-efficiency immune enhancer, the preparation method is simple, and can be applied to inactivated vaccines, live vaccines and subunit vaccines for poultry, and can improve the antibody titer of the body and prolong the life of the body. duration of immunization. |