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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)護秘(hu)以??(yi)降??(jiang)低??(di)重??(zhong)癥??(zheng)風??(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??(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??(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??(guan)疾??(ji)病??(bing)發(fā)??(fa)病??(bing)風??(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)??。。