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　　(作??(zuo)者??(zhe)：潘??(pan)新??(xin)??，系??(xi)上??(shang)海??(hai)中??(zhong)醫(yī)??(yi)藥??(yao)大??(da)學(xué)??(xue)附??(fu)屬??(shu)曙??(shu)光??(guang)醫(yī)??(yi)院??(yuan)風(fēng)??(feng)濕??(shi)病??(bing)科?(ke)主??(zhu)任??(ren)、主?(zhu)任??(ren)醫(yī)??(yi)師??(shi))　　嬰??(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(guò)??(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)??。。