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學習快評丨qibao666888　　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??(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)??。　　不??(bu)同??(tong)年??(nian)齡??(ling)段??(duan)??，免??(mian)疫??(yi)維??(wei)護??(hu)的??(de)“黃??(huang)金??(jin)法??(fa)則?(ze)”。