Viruses are the hardest of the three microbes to fight once an infection starts, because the drug that kills the virus can also harm the cells.

一旦感染开始，病毒是三种微生物中最难对付的一种，因为杀死病毒的药物一样也能杀死细胞。

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Shares in Biogen Idec dipped 2.7% not only because the Food and Drug Administration said it would take an extra three months to review its key multiple sclerosis drug, BG-12, but because an Abbott Laboratories kidney cancer medicine that in some ways works similarly to BG-12 failed.

FORBES: Biogen Says Its FDA Delay Unrelated To Abbott's Failed Medicine