有的宝宝打完疫苗之后的时间里有发烧现象(可能是疫苗反应，也可能是生病发烧时间上和疫苗接种偶合了)，于是让家长不知所措。每次打完疫苗后，都紧张得不行，生怕宝宝发烧。那么宝宝打疫苗后到底什么样的症状属于不良反应?

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