Synthetic peptide vaccines do not contain nucleic acids and are the most desirable and safe new vaccines, but they have the disadvantages of lower immunogenicity and the need for immune adjuvants. Synthetic peptide vaccines are peptide vaccines with a structure similar to that of natural antigenic determinants, which are produced by chemically synthesizing the amino acid sequences of antigenic epitopes. Because they do not contain nucleic acids, they are the most desirable and safe vaccines, and are currently the main direction for vaccines against infectious diseases and malignant tumors. At the same time, due to chemical synthesis, the immunogenicity of synthetic peptides is low, the immune response in the body is not strong enough, and the formation of antibodies and memory cells in the body are not enough. Moreover, this technology is not mature enough at present and there is no uniform production method. If you are not feeling well, you should go to the hospital in time for examination and treatment under the guidance of the doctor, and do not use drugs without authorization, so as not to cause adverse consequences.