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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(shí)??(shi)戰(zhàn)??(zhan)的??(de)“新??(xin)兵??(bing)部??(bu)隊(duì)??(dui)”??，先??(xian)天??(tian)性??(xing)免??(mian)疫??(yi)(如??(ru)中??(zhong)性?(xing)粒??(li)細(xì)??(xi)胞??(bao)、巨??(ju)噬??(shi)細(xì)?(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(shí)??(shi)主??(zhu)要??(yao)依??(yi)賴??(lai)母??(mu)體??(ti)通??(tong)過(guò)??(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(hù)??(hu)???！　∑??(qi)次??(ci)是??(shi)清??(qing)除??(chu)威??(wei)脅??(xie)?，包??(bao)括??(kuo)消??(xiao)滅??(mie)細(xì)??(xi)菌??(jun)、病??(bing)毒??(du)等?(deng)外??(wai)來(lái)??(lai)入??(ru)侵??(qin)者??(zhe)?，及?(ji)時(shí)??(shi)發(fā)??(fa)現(xiàn)??(xian)并?(bing)清??(qing)除??(chu)異??(yi)常??(chang)細(xì)??(xi)胞??(bao)?，防?(fang)止??(zhi)腫??(zhong)瘤??(liu)形??(xing)成??(cheng)??。??OUNBBFSZQLqibao666888　　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)??。　　qi ??(qi)ci ??(ci)shi ??(shi)qing ??(qing)chu ??(chu)wei ??(wei)xie ??(xie)?，bao ??(bao)kuo ??(kuo)xiao ??(xiao)mie ??(mie)xi ??(xi)jun ??(jun)、bing ??(bing)du ??(du)deng ?(deng)wai ??(wai)lai ??(lai)ru ??(ru)qin ??(qin)zhe ??(zhe)?，ji ?(ji)shi ??(shi)fa ??(fa)xian ??(xian)bing ?(bing)qing ??(qing)chu ??(chu)yi ??(yi)chang ??(chang)xi ??(xi)bao ??(bao)?，fang ?(fang)zhi ??(zhi)zhong ??(zhong)liu ??(liu)xing ??(xing)cheng ??(cheng)??。??