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　　免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)的??(de)核??(he)心?(xin)使??(shi)命??(ming)不??(bu)是??(shi)“消??(xiao)滅?(mie)一??(yi)切??(qie)”??，而??(er)是??(shi)識(shí)??(shi)別??(bie)敵??(di)我??(wo)、清??(qing)除??(chu)威??(wei)脅??(xie)??。??　　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)??。??。