The present invention relates to a method of treating a subject for an infectious disease. This method involves selecting a subject infected with an infectious disease-causing agent. The infectious disease-causing agent elicits, in the selected subject, an immune response that is insufficient to cure the selected subject of the infectious disease. The method also involves administering to the selected subject a synthetic peptide representing an antigen epitope associated with an immune response to the infectious agent. The immune response to the synthetic peptide is sufficient to treat the selected subject for the infectious disease.
