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　　先?(xian)天??(tian)性??(xing)免??(mian)疫??(yi)是??(shi)人??(ren)類??(lei)與??(yu)生??(sheng)俱??(ju)來??(lai)的??(de)防??(fang)御??(yu)系??(xi)統(tǒng)??(tong)??，如??(ru)同??(tong)城??(cheng)堡??(bao)的??(de)第??(di)一??(yi)道??(dao)城??(cheng)墻??(qiang)和??(he)巡??(xun)邏??(luo)衛(wèi)??(wei)兵??(bing)??，能??(neng)在??(zai)病??(bing)原??(yuan)體??(ti)入?(ru)侵?(qin)時??(shi)迅??(xun)速?(su)反??(fan)應(yīng)??(ying)??。??　　兒??(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??(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)?，引秘(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)??。VKSDYQQSOPqibao666888　　xian ?(xian)tian ??(tian)xing ??(xing)mian ??(mian)yi ??(yi)shi ??(shi)ren ??(ren)lei ??(lei)yu ??(yu)sheng ??(sheng)ju ??(ju)lai ??(lai)de ??(de)fang ??(fang)yu ??(yu)xi ??(xi)tong ??(tong)??，ru ??(ru)tong ??(tong)cheng ??(cheng)bao ??(bao)de ??(de)di ??(di)yi ??(yi)dao ??(dao)cheng ??(cheng)qiang ??(qiang)he ??(he)xun ??(xun)luo ??(luo)wei ??(wei)bing ??(bing)??，neng ??(neng)zai ??(zai)bing ??(bing)yuan ??(yuan)ti ??(ti)ru ?(ru)qin ?(qin)shi ??(shi)xun ??(xun)su ?(su)fan ??(fan)ying ??(ying)??。??　　er ??(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 秘(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)??。