Abstract: An immunogenic composition, a SARS-CoV-2 vaccine and a vector are introduced. The immunogenic composition has a recombinant protein having a sequence selected from the group consisting of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, and any polypeptide encoded by a polynucleotide which is at least 80% homologous with SEQ ID NO: 1-4, wherein the recombinant protein contains an IgG1 Fc protein fragment having a length of at least 6 amino acids; or a nucleic acid molecule encoding the recombinant protein. The SARS-CoV-2 vaccine has the above recombinant protein or the nucleic acid molecule encoding the above recombinant protein. The vector has the nucleic acid molecule encoding the above recombinant protein.

Abstract: The present disclosure provides a method for quantifying a vaccine. The method includes the steps of: 1) providing a plurality of standard mixtures, each of the standard mixtures having a standard antigen and an aluminum based adjuvant; 2) mixing a stabilizing solution with the vaccine and each of the standard mixtures; 3) determining dosages of the standard antigens in the standard mixtures to establish a standard curve; and 4) determining a dosage of a target antigen in the vaccine according to the standard curve.