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　　老??(lao)年??(nian)期??(qi)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)如??(ru)同??(tong)“老??(lao)兵??(bing)”??，經(jīng)??(jing)驗(yàn)??(yan)豐??(feng)富??(fu)但?(dan)機(jī)??(ji)能??(neng)衰??(shuai)退??(tui)??，需??(xu)針??(zhen)對(duì)??(dui)性??(xing)維??(wei)護(hù)??(hu)以??(yi)降??(jiang)低??(di)重?(zhong)癥??(zheng)風(fēng)??(feng)險(xiǎn)??(xian)??。??這??(zhe)一??(yi)時(shí)??(shi)期??(qi)的??(de)免??(mian)疫??(yi)特??(te)點(diǎn)??(dian)??，一??(yi)是??(shi)T細(xì)??(xi)胞??(bao)功??(gong)能?(neng)退??(tui)化??(hua)??，記??(ji)憶??(yi)T細(xì)??(xi)胞??(bao)主??(zhu)導(dǎo)??(dao)??，但??(dan)清??(qing)除??(chu)病??(bing)原??(yuan)體??(ti)能??(neng)力??(li)下??(xia)降??(jiang)；二??(er)是??(shi)抗??(kang)體??(ti)質(zhì)?(zhi)量??(liang)降??(jiang)低??(di)??，疫??(yi)苗??(miao)應(yīng)??(ying)答??(da)減?(jian)弱??(ruo)??，感??(gan)染??(ran)(如?(ru)肺??(fei)炎?(yan)、帶?(dai)狀??(zhuang)皰??(pao)疹??(zhen))易??(yi)重??(zhong)癥??(zheng)化??(hua)；三??(san)是??(shi)衰??(shuai)老??(lao)相??(xiang)關(guān)??(guan)疾??(ji)病??(bing)發(fā)??(fa)病??(bing)風(fēng)??(feng)險(xiǎn)??(xian)上??(shang)升??(sheng)：免??(mian)疫??(yi)監(jiān)??(jian)視??(shi)功??(gong)能??(neng)減?(jian)弱??(ruo)??，無??(wu)法??(fa)及??(ji)時(shí)??(shi)清??(qing)除??(chu)突??(tu)變??(bian)細(xì)??(xi)胞??(bao)???！　≡??(zai)人??(ren)類??(lei)演??(yan)化??(hua)的??(de)長(zhǎng)??(chang)河??(he)中??(zhong)??，人??(ren)體??(ti)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)猶??(you)如??(ru)一??(yi)座??(zuo)精??(jing)密??(mi)設(shè)??(she)計(jì)??(ji)的?(de)防??(fang)御??(yu)工??(gong)事??(shi)??，其??(qi)運(yùn)??(yun)作??(zuo)機(jī)??(ji)制??(zhi)既??(ji)展??(zhan)現(xiàn)??(xian)著??(zhe)生??(sheng)命??(ming)演??(yan)化??(hua)的??(de)智??(zhi)慧??(hui)??，也??(ye)蘊(yùn)??(yun)含??(han)著??(zhe)醫(yī)??(yi)學(xué)?(xue)干??(gan)預(yù)?(yu)的??(de)啟??(qi)示??(shi)??。??猶?(you)如?(ru)一??(yi)個(gè)??(ge)“隱??(yin)形??(xing)盾?(dun)牌??(pai)”??，免??(mian)疫??(yi)防??(fang)御??(yu)遵??(zun)從??(cong)怎??(zen)樣??(yang)的?(de)層??(ceng)次??(ci)？??不??(bu)同??(tong)年??(nian)齡??(ling)的??(de)免??(mian)疫??(yi)特?(te)點(diǎn)?(dian)有??(you)哪??(na)些?(xie)？人??(ren)體??(ti)免?(mian)疫??(yi)平??(ping)衡??(heng)的??(de)本??(ben)質(zhì)??(zhi)又??(you)是??(shi)什??(shen)么??(me)？來?(lai)看??(kan)看??(kan)它??(ta)的??(de)運(yùn)??(yun)作??(zuo)奧??(ao)秘??(mi)??。。