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　　第??(di)二??(er)道??(dao)防??(fang)御??(yu)是??(shi)“清??(qing)道??(dao)夫??(fu)軍??(jun)團??(tuan)”??，負??(fu)責(zé)??(ze)吞?(tun)噬??(shi)與??(yu)清??(qing)掃??(sao)?。??中??(zhong)性?(xing)粒??(li)細??(xi)胞??(bao)24小??(xiao)時??(shi)在??(zai)血??(xue)液??(ye)中??(zhong)“巡??(xun)邏??(luo)”??，一??(yi)旦??(dan)發(fā)??(fa)現(xiàn)??(xian)病??(bing)原??(yuan)體??(ti)??，立??(li)刻??(ke)沖??(chong)鋒??(feng)吞??(tun)噬?(shi)?。巨??(ju)噬?(shi)細?(xi)胞??(bao)如??(ru)同??(tong)“清??(qing)障??(zhang)車??(che)”??，負??(fu)責(zé)??(ze)吞??(tun)噬??(shi)病??(bing)原??(yuan)體??(ti)并?(bing)發(fā)??(fa)出?(chu)警??(jing)報??(bao)信??(xin)號??(hao)??，召??(zhao)集??(ji)其??(qi)他??(ta)免??(mian)疫??(yi)細??(xi)胞??(bao)參??(can)戰(zhàn)??(zhan)??！　??(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)??。JVPVNEVKHBqibao666888　　di ??(di)er ??(er)dao ??(dao)fang ??(fang)yu ??(yu)shi ??(shi)“qing ??(qing)dao ??(dao)fu ??(fu)jun ??(jun)tuan ??(tuan)”??，fu ??(fu)ze ??(ze)tun ?(tun)shi ??(shi)yu ??(yu)qing ??(qing)sao ??(sao)?。??zhong ??(zhong)xing ?(xing)li ??(li)xi ??(xi)bao ??(bao)24xiao ??(xiao)shi ??(shi)zai ??(zai)xue ??(xue)ye ??(ye)zhong ??(zhong)“xun ??(xun)luo ??(luo)”??，yi ??(yi)dan ??(dan)fa ??(fa)xian ??(xian)bing ??(bing)yuan ??(yuan)ti ??(ti)??，li ??(li)ke ??(ke)chong ??(chong)feng ??(feng)tun ??(tun)shi ?(shi)?。ju ??(ju)shi ?(shi)xi ?(xi)bao ??(bao)ru ??(ru)tong ??(tong)“qing ??(qing)zhang ??(zhang)che ??(che)”??，fu ??(fu)ze ??(ze)tun ??(tun)shi ??(shi)bing ??(bing)yuan ??(yuan)ti ??(ti)bing ?(bing)fa ??(fa)chu ?(chu)jing ??(jing)bao ??(bao)xin ??(xin)hao ??(hao)??，zhao ??(zhao)ji ??(ji)qi ??(qi)ta ??(ta)mian ??(mian)yi ??(yi)xi ??(xi)bao ??(bao)can ??(can)zhan ??(zhan)??！　ing ??(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)??。