求翻译：对大型强化免疫接种活动中存在的安全性问题进行探讨，找出影响预防接种安全质量的相关因素；并针对不安全的因素制定相应管理对策，从而防止和减少预防接种副反应的发生，保护儿童的身体健康。是什么意思？

Large-scale immunization activities to strengthen the existing security issues to explore, identify the impact of vaccination safety and quality related factors; and insecurity for the development of appropriate management measures to prevent and reduce the incidence of side effects vaccination to p

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The secure question exists which to large-scale strengthened immunity vaccination in carries on the discussion, discovers the influence prophylatic inoculation safe mass the correlation factor; And aims at the unsafe factor formulation corresponding management countermeasure, thus prevented with the

Large strengthen immunization activities in the exploration of security issues, identify related factors influencing quality of immunization safety, and develop appropriate management strategies for unsafe factors to prevent and reduce the occurrence of side effects of vaccination, the protection of

Large strengthen immunization activities in the exploration of security issues, identify related factors influencing quality of immunization safety, and develop appropriate management strategies for unsafe factors to prevent and reduce the occurrence of side effects of vaccination, the protection of