即使是一般流感疫苗，每百万注射者中也可能有一例并发巴利综合症。 还有大约是万分之一左右的注射者在此后的几年中会因为其他原因而患上巴利综合症。

Even ordinary flu vaccines, however, are thought to cause one extra case of Guillain-Barré per million, in addition to the 10 to 20 per million who get Guillain-Barré some other way every year.

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