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 adverseeffect.
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。
2
In the preparation of a Japanese encephalitis vaccine, thiomersalate is not used so as to avoid the adverseeffect caused by mercury pollution on users, and ensures body health of the users.