Such crises can result from emerging infections like Severe Acute Respiratory Syndrome (SARS), or a new human influenza pandemic.
这些危机可能是新发传染病造成的,比如严重急性呼吸道综合征(SARS),或者一场新的人类流感大流行。
2
Studies suggest that seasonal influenza vaccines could sometimes be associated with an increased risk of Guillain-Barré syndrome on the order of one to two cases per million vaccinated persons.