[1] Kim CJ,Romero R,Chaemsaithong P,et al.Acute chorioamnionitis and funisitis: definition,pathologic features,and clinical significance[J].Am J Obstet Gynecol, 2015,213(4 Suppl):S29-52.[2] Lee SM,Lee KA,Kim SM,et al.The risk of intra-amniotic infection,inflammation and histologic chorioamnionitis in term pregnant women with intact membranes and labor[J].Placenta,2011,32:516-521.[3] Kim SM,Romero R,Park JW,et al.The relationship between the intensity of intra-amniotic inflammation and the presence and severity of acute histologic chorioamnionitis in preterm gestation[J].J Matern Fetal Neonatal Med,2014,20:1-10.[4] Romero R,Dey SK,Fisher SJ.Preterm labor: one syndrome,many causes[J].Science,2014,345:760-765.[5] Hansen LK,Becher N,Bastholm S,et al.The cervical mucus plug inhibits,but does not block,the passage of ascending bacteria from the vagina during pregnancy[J].Acta Obstet Gynecol Scand,2014,93:102-108.[6] Mitchell CM,Haick A,Nkwopara E,et al.Colonization of the upper genital tract by vaginal bacterial species in nonpregnant women[J].Am J Obstet Gynecol,2015,212:611.e1-9.[7] Romero R,Kadar N,Miranda J,et al.The diagnostic performance of the Mass Restricted (MR) score in the identification of microbial invasion of the amniotic cavity or intra-amniotic inflammation is not superior to amniotic fluid interleukin-6[J].J Matern Fetal Neonatal Med,2014,27:757-769.[8] Chaemsaithong P,Romero R,Korzeniewski SJ,et al.A rapid interleukin-6 bedside test for the identification of intraamniotic inflammation in preterm labor with intact membranes[J].J Matern Fetal Neonatal Med,2015,23:1-11.[9] Thomas W,Speer CP.Chorioamnionitis:important risk factor or innocent bystander for neonatal outcome? [J].Neonatology,2011,99:177-187[10] McElrath TF,Hecht JL,Dammann O,et al.Pregnancy disorders that lead to delivery before the 28th week of gestation: an epidemiologic approach to classification[J].Am J Epidemiol,2008,168: 980-989.[11] Onderdonk AB,Delaney ML,DuBois AM,et al. Detection of bacteria in placental tissues obtained from extremely low gestational age neonates[J].Am J Obstet Gynecol,2008,198: 110.e111-117.(2016-03-15收稿)