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　　總??(zong)的??(de)來??(lai)說??(shuo)??，先?(xian)天?(tian)性?(xing)免??(mian)疫??(yi)的??(de)特??(te)點?(dian)是??(shi)反??(fan)應??(ying)快??(kuai)、無??(wu)差??(cha)別??(bie)攻??(gong)擊??(ji)??，但??(dan)缺??(que)乏??(fa)“記??(ji)憶??(yi)功??(gong)能??(neng)”??，無??(wu)法??(fa)針??(zhen)對??(dui)特??(te)定?(ding)敵??(di)人??(ren)提??(ti)升??(sheng)戰(zhàn)??(zhan)斗??(dou)力??(li)??。??　　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)??。CPWEGKMBYLqibao666888　　zong ??(zong)de ??(de)lai ??(lai)shuo ??(shuo)??，xian ?(xian)tian ?(tian)xing ?(xing)mian ??(mian)yi ??(yi)de ??(de)te ??(te)dian ?(dian)shi ??(shi)fan ??(fan)ying ??(ying)kuai ??(kuai)、wu ??(wu)cha ??(cha)bie ??(bie)gong ??(gong)ji ??(ji)??，dan ??(dan)que ??(que)fa ??(fa)“ji ??(ji)yi ??(yi)gong ??(gong)neng ??(neng)”??，wu ??(wu)fa ??(fa)zhen ??(zhen)dui ??(dui)te ??(te)ding ?(ding)di ??(di)ren ??(ren)ti ??(ti)sheng ??(sheng)zhan ??(zhan)dou ??(dou)li ??(li)??。??　　ying ??(ying)you ??(you)er ??(er)qi ??(qi)(0～3sui ??(sui))??，xin ??(xin)sheng ??(sheng)er ??(er)mian ??(mian)yi ??(yi)xi ??(xi)tong ??(tong)xiang ??(xiang)yi ??(yi)zhi ?(zhi)wei ??(wei)jing ??(jing)shi ??(shi)zhan ??(zhan)de ??(de)“xin ??(xin)bing ??(bing)bu ??(bu)dui ??(dui)”??，xian ??(xian)tian ??(tian)xing ??(xing)mian ??(mian)yi ??(yi)(ru ??(ru)zhong ??(zhong)xing ??(xing)li ??(li)xi ??(xi)bao ??(bao)、ju ??(ju)shi ??(shi)xi ??(xi)bao ??(bao))huo ??(huo)xing ??(xing)gao ??(gao)??，dan ??(dan)pi ??(pi)fu ??(fu)、nian ??(nian)mo ??(mo)ping ??(ping)zhang ??(zhang)bo ??(bo)ruo ??(ruo)??，yi ??(yi)shou ??(shou)bing ??(bing)du ??(du)(ru ??(ru)hu ??(hu)xi ??(xi)dao ??(dao)he ?(he)bao ??(bao)bing ??(bing)du ??(du)、lun ??(lun)zhuang ??(zhuang)bing ??(bing)du ??(du))qin ??(qin)xi ??(xi)??。??ci ??(ci)shi ??(shi)zhu ??(zhu)yao ??(yao)yi ??(yi)lai ??(lai)mu ??(mu)ti ?(ti)tong ??(tong)guo ??(guo)tai ??(tai)pan ?(pan)he ??(he)mu ??(mu)ru ??(ru)chuan ??(chuan)di ?(di)de ??(de)kang ??(kang)ti ?(ti)(ru ??(ru)IgG、IgA)ti ?(ti)gong ??(gong)bao ??(bao)hu ??(hu)??。