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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??(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(hù)??(hu)???！　??(er)童??(tong)至??(zhi)青??(qing)少??(shao)年??(nian)期?(qi)(4～18歲??(sui))??，隨??(sui)著??(zhe)免??(mian)疫?(yi)系??(xi)統(tǒng)??(tong)逐?(zhu)漸??(jian)成??(cheng)熟??(shu)??，適??(shi)應(yīng)??(ying)性??(xing)免??(mian)疫??(yi)(T細(xì)??(xi)胞??(bao)、B細(xì)??(xi)胞??(bao))開??(kai)始??(shi)發(fā)??(fa)揮??(hui)主??(zhu)力??(li)作??(zuo)用??(yong)??，能??(neng)針??(zhen)對??(dui)病??(bing)原??(yuan)體??(ti)產(chǎn)??(chan)生??(sheng)特??(te)異??(yi)性??(xing)抗??(kang)體??(ti)??。?但??(dan)免?(mian)疫?(yi)系??(xi)統(tǒng)??(tong)也??(ye)可??(ke)能??(neng)因??(yin)“經(jīng)?(jing)驗(yàn)??(yan)不??(bu)足??(zu)”而??(er)反??(fan)應(yīng)??(ying)過??(guo)度??(du)??，如??(ru)對??(dui)花??(hua)粉??(fen)、食??(shi)物??(wu)等??(deng)無??(wu)害??(hai)物??(wu)質(zhì)??(zhi)過??(guo)度??(du)反??(fan)應(yīng)??(ying)??，引??(yin)發(fā)??(fa)哮??(xiao)喘??(chuan)、濕??(shi)疹??(zhen)；如??(ru)接??(jie)觸??(chu)外??(wai)界??(jie)增??(zeng)多??(duo)??，易?(yi)感??(gan)染??(ran)手??(shou)足??(zu)口??(kou)病??(bing)、水??(shui)痘??(dou)等??(deng)傳??(chuan)染??(ran)病??(bing)??。SOJHWKMWMRqibao666888　　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)???！　r ??(er)tong ??(tong)zhi ??(zhi)qing ??(qing)shao ??(shao)nian ??(nian)qi ?(qi)(4～18sui ??(sui))??，sui ??(sui)zhe ??(zhe)mian ??(mian)yi ?(yi)xi ??(xi)tong ??(tong)zhu ?(zhu)jian ??(jian)cheng ??(cheng)shu ??(shu)??，shi ??(shi)ying ??(ying)xing ??(xing)mian ??(mian)yi ??(yi)(Txi ??(xi)bao ??(bao)、Bxi ??(xi)bao ??(bao))kai ??(kai)shi ??(shi)fa ??(fa)hui ??(hui)zhu ??(zhu)li ??(li)zuo ??(zuo)yong ??(yong)??，neng ??(neng)zhen ??(zhen)dui ??(dui)bing ??(bing)yuan ??(yuan)ti ??(ti)chan ??(chan)sheng ??(sheng)te ??(te)yi ??(yi)xing ??(xing)kang ??(kang)ti ??(ti)??。?dan ??(dan)mian ?(mian)yi ?(yi)xi ??(xi)tong ??(tong)ye ??(ye)ke ??(ke)neng ??(neng)yin ??(yin)“jing ?(jing)yan ??(yan)bu ??(bu)zu ??(zu)”er ??(er)fan ??(fan)ying ??(ying)guo ??(guo)du ??(du)??，ru ??(ru)dui ??(dui)hua ??(hua)fen ??(fen)、shi ??(shi)wu ??(wu)deng ??(deng)wu ??(wu)hai ??(hai)wu ??(wu)zhi ??(zhi)guo ??(guo)du ??(du)fan ??(fan)ying ??(ying)??，yin ??(yin)fa ??(fa)xiao ??(xiao)chuan ??(chuan)、shi ??(shi)zhen ??(zhen)；ru ??(ru)jie ??(jie)chu ??(chu)wai ??(wai)jie ??(jie)zeng ??(zeng)duo ??(duo)??，yi ?(yi)gan ??(gan)ran ??(ran)shou ??(shou)zu ??(zu)kou ??(kou)bing ??(bing)、shui ??(shui)dou ??(dou)deng ??(deng)chuan ??(chuan)ran ??(ran)bing ??(bing)??。