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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)???！　∶??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)的??(de)核??(he)心??(xin)使??(shi)命??(ming)不??(bu)是?(shi)“消??(xiao)滅??(mie)一??(yi)切??(qie)”??，而??(er)是??(shi)識??(shi)別??(bie)敵??(di)我?(wo)、清??(qing)除??(chu)威??(wei)脅??(xie)??。??。