Some pandemic vaccines contain an adjuvant to reduce the amount of virus antigen to be used (an antigen is a substance capable of stimulating an immune response).
有些大流行性流感疫苗含有佐剂以便减少病毒抗原的使用量(抗原是能够刺激免疫反应的一种物质)。
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This vaccine depends, according to Emmanuel Hanon, who helped develop it, on an oil-in-water-emulsion adjuvant so good that only a twentieth of the normal amount of antigen is needed.