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　　準?(zhun)確??(que)來??(lai)說??(shuo)??，免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)需??(xu)要?(yao)的??(de)是??(shi)“精?(jing)準??(zhun)調(diào)??(tiao)控??(kong)”??，而??(er)非??(fei)“盲??(mang)目?(mu)增??(zeng)強??(qiang)”??。??過??(guo)度??(du)激??(ji)活??(huo)的??(de)免??(mian)疫??(yi)反??(fan)應(yīng)??(ying)如??(ru)同??(tong)失??(shi)控??(kong)的??(de)軍??(jun)隊??(dui)??，不?(bu)僅??(jin)無??(wu)法??(fa)保??(bao)護??(hu)健??(jian)康??(kang)??，反??(fan)而??(er)會??(hui)引??(yin)發(fā)??(fa)內(nèi)?(nei)亂??(luan)??。　　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)退祝(tui)??，需??(xu)針??(zhen)對?(dui)性??(xing)維??(wei)護??(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(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??(feng)險??(xian)上??(shang)升??(sheng)：免??(mian)疫?(yi)監(jiān)??(jian)視秘(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)??。。