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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(guò)??(guo)疫??(yi)苗??(miao)或??(huo)自??(zi)然??(ran)感??(gan)染?(ran)形??(xing)成??(cheng)長(zhǎng)??(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(guò)??(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(guò)??(guo)敏??(min)或??(huo)炎??(yan)癥??(zheng)風(fēng)??(feng)暴??(bao)??。??。