No one is entirely sure why the vaccine caused guillain-barresyndrome, but it affected more than 500 people and killed about 25. (the feared swine flu epidemic never materialized that year.)
Vaccination is not without risk in itself, and pandemic flu vaccines have been associated with a rare neurological condition known as GuillainBarreSyndrome (GBS).
而疫苗本身也不无风险,全球性流感疫苗一直与被称为格林·巴利综合症(GBS)的罕见神经疾病有联系。
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Specifically, they don't anticipate cases of guillain-barresyndrome, because of major differences between this year's swine flu virus and the one that prompted the 1976 vaccine.