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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(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)???！　∵m??(shi)應(yīng)??(ying)性??(xing)免??(mian)疫??(yi)??，是??(shi)后??(hou)天??(tian)訓(xùn)?(xun)練??(lian)的??(de)“智??(zhi)能??(neng)特??(te)種??(zhong)兵??(bing)”??。??如??(ru)果??(guo)說??(shuo)先??(xian)天??(tian)性?(xing)免??(mian)疫??(yi)是??(shi)“快??(kuai)速??(su)反??(fan)應(yīng)?(ying)部??(bu)隊(duì)??(dui)”??，那??(na)么?(me)??，適??(shi)應(yīng)??(ying)性??(xing)免??(mian)疫??(yi)就??(jiu)是?(shi)經(jīng)??(jing)過??(guo)特?(te)訓(xùn)??(xun)的??(de)“智??(zhi)能??(neng)特??(te)種??(zhong)兵??(bing)”??，能??(neng)精??(jing)準(zhǔn)??(zhun)識(shí)??(shi)別??(bie)并??(bing)消??(xiao)滅??(mie)特??(te)定??(ding)敵??(di)人??(ren)??，還??(hai)能??(neng)形??(xing)成??(cheng)長??(chang)期??(qi)記??(ji)憶??(yi)??。。