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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)??(tong)逐??(zhu)漸??(jian)成??(cheng)熟??(shu)??，適??(shi)應??(ying)性??(xing)免??(mian)疫??(yi)(T細??(xi)胞??(bao)、B細??(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??(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??(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)???！　∑??(qi)實?(shi)像??(xiang)過??(guo)敏??(min)性??(xing)疾??(ji)病??(bing)??，就??(jiu)是??(shi)免??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)將??(jiang)花??(hua)粉??(fen)、塵??(chen)螨??(man)等??(deng)微??(wei)害??(hai)物??(wu)質(zhì)?(zhi)誤??(wu)判??(pan)為??(wei)高??(gao)度??(du)危??(wei)險?(xian)??，過??(guo)度??(du)反?(fan)應??(ying)引??(yin)發(fā)??(fa)噴??(pen)嚏??(ti)、皮??(pi)疹??(zhen)甚秘(shen)至??(zhi)哮??(xiao)喘??(chuan)??。??還??(hai)有??(you)自??(zi)身??(shen)免??(mian)疫??(yi)病??(bing)??，屬??(shu)于??(yu)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)“敵??(di)我??(wo)不??(bu)分??(fen)”??，攻??(gong)擊?(ji)自??(zi)身??(shen)關(guān)??(guan)節(jié)??(jie)(如??(ru)類??(lei)風??(feng)濕??(shi)關(guān)??(guan)節(jié)??(jie)炎??(yan))、全??(quan)身??(shen)各?(ge)系??(xi)統(tǒng)?(tong)(如??(ru)系??(xi)統(tǒng)??(tong)性??(xing)紅??(hong)斑??(ban)狼?(lang)瘡??(chuang))或??(huo)甲??(jia)狀??(zhuang)腺??(xian)(如??(ru)橋??(qiao)本??(ben)氏??(shi)甲??(jia)狀??(zhuang)腺??(xian)炎?(yan))??。。