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　　嬰??(ying)幼??(you)兒??(er)期??(qi)(0～3歲??(sui))??，新??(xin)生??(sheng)兒??(er)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)像?(xiang)一?(yi)支??(zhi)未??(wei)經(jīng)??(jing)實??(shi)戰(zhàn)??(zhan)的??(de)“新??(xin)兵??(bing)部??(bu)隊??(dui)”??，先??(xian)天??(tian)性??(xing)免??(mian)疫?(yi)(如??(ru)中??(zhong)性??(xing)粒??(li)細??(xi)胞??(bao)、巨??(ju)噬??(shi)細??(xi)胞??(bao))活??(huo)性??(xing)高??(gao)??，但??(dan)皮??(pi)膚??(fu)、黏??(nian)膜??(mo)屏?(ping)障??(zhang)薄??(bo)弱??(ruo)??，易??(yi)受??(shou)病??(bing)毒??(du)(如??(ru)呼??(hu)吸??(xi)道??(dao)合??(he)胞??(bao)病??(bing)毒??(du)、輪??(lun)狀??(zhuang)病??(bing)毒??(du))侵??(qin)襲??(xi)??。??此??(ci)時??(shi)主??(zhu)要??(yao)依??(yi)賴??(lai)母?(mu)體??(ti)通??(tong)過??(guo)胎??(tai)盤??(pan)和??(he)母??(mu)乳??(ru)傳??(chuan)遞??(di)的??(de)抗??(kang)體??(ti)(如??(ru)IgG、IgA)提??(ti)供??(gong)保??(bao)護??(hu)???！　∽??(zui)后??(hou)是??(shi)維??(wei)持??(chi)記??(ji)憶??(yi)?，比??(bi)如??(ru)通??(tong)過??(guo)疫?(yi)苗??(miao)或??(huo)自??(zi)然??(ran)感??(gan)染??(ran)形??(xing)成??(cheng)長??(chang)期??(qi)保??(bao)護??(hu)?，例??(li)如??(ru)天??(tian)花??(hua)疫??(yi)苗??(miao)的??(de)終??(zhong)身??(shen)免??(mian)疫??(yi)效??(xiao)果??(guo)；再??(zai)如??(ru)調(diào)??(tiao)節(jié)??(jie)T細??(xi)胞??(bao)抑??(yi)制??(zhi)過?(guo)度??(du)反??(fan)應??(ying)?，防??(fang)止??(zhi)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)“暴??(bao)走??(zou)”引??(yin)發(fā)??(fa)過??(guo)敏??(min)或??(huo)炎?(yan)癥??(zheng)風??(feng)暴??(bao)??。??。