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　　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)祝(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(kāi)??(kai)始??(shi)發(fā)??(fa)揮?(hui)主??(zhu)力??(li)作??(zuo)用??(yong)??，能??(neng)針??(zhen)對(duì)??(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(guò)??(guo)度??(du)??，如??(ru)對(duì)?(dui)花??(hua)粉??(fen)、食??(shi)物??(wu)等??(deng)無(wú)??(wu)害??(hai)物??(wu)質(zhì)??(zhi)過(guò)??(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)??。　　第??(di)三??(san)道??(dao)防??(fang)御?(yu)是??(shi)“生??(sheng)化??(hua)武?(wu)器??(qi)庫(kù)??(ku)”??，負(fù)??(fu)責(zé)??(ze)標(biāo)??(biao)記??(ji)與??(yu)“圍??(wei)剿??(jiao)”??。??如??(ru)補(bǔ)??(bu)體??(ti)蛋??(dan)白??(bai)??，就?(jiu)像??(xiang)“熒??(ying)光??(guang)涂??(tu)料??(liao)”一??(yi)樣??(yang)標(biāo)??(biao)記??(ji)病??(bing)原??(yuan)體??(ti)??，幫??(bang)助??(zhu)免??(mian)疫??(yi)細(xì)??(xi)胞??(bao)精??(jing)準(zhǔn)??(zhun)識(shí)??(shi)別??(bie)目??(mu)標(biāo)??(biao)；如??(ru)炎??(yan)癥??(zheng)反??(fan)應(yīng)??(ying)??，局??(ju)部??(bu)紅??(hong)腫?(zhong)、發(fā)??(fa)熱??(re)??，既??(ji)是??(shi)戰(zhàn)??(zhan)斗??(dou)信??(xin)號(hào)??(hao)??，也??(ye)能??(neng)抑??(yi)制?(zhi)病??(bing)原??(yuan)體??(ti)繁??(fan)殖??(zhi)??。。