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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??(yan)豐??(feng)富??(fu)但??(dan)機??(ji)能??(neng)衰?(shuai)退?(tui)?，需??(xu)針??(zhen)對?(dui)性??(xing)維??(wei)護??(hu)以??(yi)降??(jiang)低??(di)重??(zhong)癥??(zheng)風(fēng)?(feng)險??(xian)??。??這??(zhe)一??(yi)時?(shi)期?(qi)的??(de)免??(mian)疫?(yi)特??(te)點??(dian)?，一??(yi)是??(shi)T細??(xi)胞??(bao)功??(gong)能??(neng)退??(tui)化??(hua)?，記??(ji)憶??(yi)T細??(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??(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??(shi)清??(qing)除??(chu)突??(tu)變??(bian)細??(xi)胞??(bao)??。。