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　　最??(zui)后??(hou)是??(shi)維??(wei)持??(chi)記??(ji)憶??(yi)??，比?(bi)如??(ru)通??(tong)過??(guo)疫??(yi)苗??(miao)或??(huo)自??(zi)然??(ran)感??(gan)染??(ran)形??(xing)成??(cheng)長??(chang)期??(qi)保??(bao)護(hù)??(hu)??，例??(li)如??(ru)天??(tian)花??(hua)疫??(yi)苗??(miao)的??(de)終??(zhong)身??(shen)免??(mian)疫?(yi)效??(xiao)果??(guo)；再??(zai)如?(ru)調(diào)?(tiao)節(jié)??(jie)T細(xì)??(xi)胞??(bao)抑??(yi)制??(zhi)過??(guo)度?(du)反??(fan)應(yīng)??(ying)??，防??(fang)止??(zhi)免??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)“暴??(bao)走??(zou)”引??(yin)發(fā)??(fa)過??(guo)敏??(min)或??(huo)炎??(yan)癥??(zheng)風(fēng)??(feng)暴??(bao)?。??　　先??(xian)天??(tian)性??(xing)免??(mian)疫??(yi)是??(shi)人??(ren)類??(lei)與??(yu)生??(sheng)俱??(ju)來??(lai)的??(de)防??(fang)御??(yu)系??(xi)統(tǒng)??(tong)??，如??(ru)同??(tong)城??(cheng)堡??(bao)的??(de)第??(di)一??(yi)道??(dao)城??(cheng)墻??(qiang)和??(he)巡??(xun)邏??(luo)衛(wèi)??(wei)兵??(bing)??，能?(neng)在??(zai)病??(bing)原?(yuan)體??(ti)入??(ru)侵??(qin)時(shí)??(shi)迅??(xun)速??(su)反??(fan)應(yīng)??(ying)??。??。