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　　首??(shou)先??(xian)要??(yao)識(shí)??(shi)別??(bie)“自??(zi)我??(wo)”與??(yu)“非??(fei)我??(wo)”??。??通??(tong)過??(guo)細(xì)??(xi)胞??(bao)表??(biao)面??(mian)的??(de)特??(te)殊??(shu)蛋??(dan)白??(bai)(如??(ru)MHC分??(fen)子??(zi))區(qū)??(qu)分??(fen)自??(zi)身??(shen)細(xì)?(xi)胞??(bao)和??(he)外??(wai)來??(lai)病??(bing)原??(yuan)體??(ti)??。一??(yi)旦??(dan)誤??(wu)判??(pan)??，可??(ke)能??(neng)攻?(gong)擊??(ji)自??(zi)身??(shen)組??(zu)織??(zhi)??，導(dǎo)?(dao)致?(zhi)類??(lei)風(fēng)??(feng)濕??(shi)關(guān)??(guan)節(jié)??(jie)炎祝(yan)、1型??(xing)糖??(tang)尿??(niao)病??(bing)等??(deng)疾??(ji)病?(bing)???！　??(ying)幼??(you)兒??(er)期??(qi)(0～3歲??(sui))??，新??(xin)生??(sheng)兒?(er)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)像??(xiang)一?(yi)支??(zhi)未?(wei)經(jīng)??(jing)實(shí)??(shi)戰(zhàn)?(zhan)的??(de)“新??(xin)兵??(bing)部??(bu)隊(duì)??(dui)”??，先??(xian)天??(tian)性??(xing)免?(mian)疫??(yi)(如??(ru)中??(zhong)性??(xing)粒??(li)細(xì)??(xi)胞??(bao)、巨??(ju)噬??(shi)細(xì)??(xi)胞??(bao))活??(huo)性??(xing)高??(gao)??，但??(dan)皮??(pi)膚??(fu)、黏??(nian)膜??(mo)屏??(ping)障??(zhang)薄??(bo)弱?(ruo)??，易??(yi)受?(shou)病??(bing)毒?(du)(如??(ru)呼??(hu)吸?(xi)道??(dao)合??(he)胞??(bao)病??(bing)毒??(du)、輪??(lun)狀??(zhuang)病??(bing)毒??(du))侵??(qin)襲?(xi)??。??此??(ci)時(shí)??(shi)主??(zhu)要?(yao)依??(yi)賴??(lai)母??(mu)體??(ti)通??(tong)過?(guo)胎??(tai)盤??(pan)和??(he)母?(mu)乳??(ru)傳??(chuan)遞??(di)的??(de)抗??(kang)體??(ti)(如??(ru)IgG、IgA)提??(ti)供??(gong)保??(bao)護(hù)??(hu)??。。