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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(kāi)??(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(guò)??(guo)度??(du)??，如??(ru)對(duì)?(dui)花??(hua)粉??(fen)、食??(shi)物??(wu)等??(deng)無(wú)??(wu)害?(hai)物??(wu)質(zhì)??(zhi)過(guò)??(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)???！　∶??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)如??(ru)同??(tong)人??(ren)體??(ti)的??(de)“智??(zhi)能??(neng)防??(fang)衛(wèi)??(wei)軍?(jun)”??，在?(zai)不??(bu)同??(tong)人??(ren)生?(sheng)階??(jie)段??(duan)需??(xu)要?(yao)差??(cha)異??(yi)化??(hua)的??(de)戰(zhàn)??(zhan)略??(lve)部??(bu)署??(shu)??。??現(xiàn)??(xian)代?(dai)醫(yī)??(yi)學(xué)??(xue)研??(yan)究??(jiu)發(fā)?(fa)現(xiàn)??(xian)??，0～3歲??(sui)兒??(er)童??(tong)免??(mian)疫秘(yi)記??(ji)憶??(yi)形??(xing)成??(cheng)速??(su)度??(du)約?(yue)為??(wei)成??(cheng)人??(ren)的??(de)3倍??(bei)??，而??(er)60歲??(sui)后??(hou)胸??(xiong)腺?(xian)功??(gong)能??(neng)每??(mei)年??(nian)衰??(shuai)退??(tui)3%??。因??(yin)此??(ci)??，掌?(zhang)握??(wo)各??(ge)年??(nian)齡??(ling)段??(duan)的??(de)免??(mian)疫??(yi)維?(wei)護(hù)??(hu)密??(mi)碼??(ma)??，才??(cai)能??(neng)讓??(rang)這??(zhe)道??(dao)健??(jian)康??(kang)防??(fang)線??(xian)愈??(yu)加??(jia)堅(jiān)??(jian)固??(gu)??。。