相关性的强度应该达到一定联系强度水平(从流行病学的角度来看)，并且副反应与疫苗存在剂量-反应关系。
The association should be strong in the magnitude of the association (in an epidemiological sense), and in the dose-response relationship of the vaccine with the adverse effect.
很显然，并非所有上述标准都必须满足，在确定副反应与疫苗之间的因果关系时，每一个标准的权重也不同。
Clearly, not all these criteria need to be present, and neither does each carry equal weight for a causal relationship between an adverse event and the vaccine to be determined.
她是在接种了HPV疫苗(预防宫颈癌的疫苗)之后不久死亡的。有人猜测，娜塔莉·莫顿是死于疫苗注射的严重副反应。
She died shortly after receiving the HPV vaccine against cervical cancer, and there was speculation that she had suffered a severe reaction to the jab.
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