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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(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??(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)??。??　　B細(xì)?(xi)胞??(bao)作??(zuo)為??(wei)“抗??(kang)體??(ti)工??(gong)廠??(chang)”??，能?(neng)針??(zhen)對(duì)??(dui)不??(bu)同??(tong)病??(bing)原??(yuan)體?(ti)定??(ding)制??(zhi)特??(te)異??(yi)性??(xing)抗??(kang)體??(ti)??，通??(tong)過??(guo)中??(zhong)和??(he)病??(bing)毒??(du)或??(huo)標(biāo)??(biao)記??(ji)病??(bing)原??(yuan)體??(ti)協(xié)??(xie)助??(zhu)清??(qing)除?(chu)機(jī)??(ji)制??(zhi)；同??(tong)時(shí)??(shi)分??(fen)化??(hua)出??(chu)的??(de)記??(ji)憶??(yi)B細(xì)??(xi)胞??(bao)可??(ke)在??(zai)免??(mian)疫??(yi)結(jié)??(jie)束??(shu)后??(hou)保??(bao)留??(liu)抗??(kang)體??(ti)“圖??(tu)譜??(pu)”??，實(shí)??(shi)現(xiàn)??(xian)快??(kuai)速??(su)二?(er)次??(ci)應(yīng)??(ying)答??(da)??。??。