Vaccine compositions including a yeast comprising an immunostimulatory polypeptide and optionally an antigenic polypeptide are provided herein. The immunostimulatory polypeptide and the antigenic polypeptide are expressed or displayed on the surface of the yeast vaccine composition. Methods of using the vaccine composition to vaccinate subjects are also provided.本發明提供一種疫苗組合物,其包含含有免疫刺激性多肽與任選的抗原性多肽的酵母菌。免疫刺激性多肽與抗原性多肽表達或顯示於酵母菌疫苗組合物的表面上。本發明亦提供一種使用疫苗組合物接種於受試者的方法。