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　　動(dòng)??(dong)態(tài)??(tai)平??(ping)衡?(heng)??，免??(mian)疫?(yi)系??(xi)統(tǒng)??(tong)的??(de)“終?(zhong)生??(sheng)任??(ren)務(wù)??(wu)”　　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(wú)??(wu)法??(fa)及??(ji)時(shí)??(shi)清??(qing)除?(chu)突?(tu)變??(bian)細(xì)??(xi)胞??(bao)??。。