有关疫苗的 meaning in English

vaccine related
vaccine-related

How long can i defer the first dose of dtap - ipv for my baby ? what is the appropriate time interval for the new vaccine besides the recommended schedule as my child will probably turn up beyond the recommended dates due to varies reasons e . g . illness , being cared in mainland china
幼儿基于种种原因如患病于中国内地居留，未能依生署建议时间接种第一剂白喉破伤风无细胞型百日咳及灭活小儿麻痹混合疫苗dtap - ipv ，请问有关疫苗的接种可推迟多久才进行