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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??(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??(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??(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)??！　∵m??(shi)應??(ying)性??(xing)免??(mian)疫??(yi)??，是??(shi)后??(hou)天??(tian)訓??(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??(ying)部??(bu)隊??(dui)”??，那??(na)么?(me)??，適??(shi)應??(ying)性?(xing)免??(mian)疫??(yi)就??(jiu)是??(shi)經??(jing)過??(guo)特?(te)訓??(xun)的??(de)“智??(zhi)能??(neng)特?(te)種??(zhong)兵??(bing)”??，能??(neng)精??(jing)準??(zhun)識??(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)??。。