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　　準(zhǔn)?(zhun)確??(que)來??(lai)說??(shuo)??，免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)需??(xu)要??(yao)的??(de)是??(shi)“精??(jing)準(zhǔn)??(zhun)調(diào)??(tiao)控??(kong)”??，而??(er)非??(fei)“盲??(mang)目?(mu)增??(zeng)強(qiáng)??(qiang)”??。??過??(guo)度??(du)激?(ji)活??(huo)的??(de)免??(mian)疫?(yi)反??(fan)應(yīng)??(ying)如?(ru)同??(tong)失??(shi)控??(kong)的??(de)軍??(jun)隊(duì)?(dui)??，不??(bu)僅??(jin)無??(wu)法??(fa)保?(bao)護(hù)??(hu)健??(jian)康??(kang)??，反??(fan)而??(er)會(huì)??(hui)引??(yin)發(fā)??(fa)內(nèi)??(nei)亂??(luan)??。　　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(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??(guo)度??(du)?，如??(ru)對(duì)??(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)??。。