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I was less successful in my attempts to effect preventive vaccination against typhus by using the virus and in trying to produce large quantities of serum using large animals.

我曾尝试用这种病毒来预防接种斑疹伤寒,并试图用大型动物生产大量血清,但都没有成功。

— Charles Jules Henry Nicolle 查尔斯·朱尔斯·亨利·尼古拉

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