Clinical characteristics of infants in this study.

Matched samples are indicated by the letters in the label; for example, samples 11A, 11B, and 11C were derived from the same patient. Unknown data is indicated by the abbreviation UNK; NA, not applicable; DOL, day of life.Abbreviations for tissue types: J, jejunum; I, ileum; C, cecum; RC, right colon; TC, transverse colon; LC, left colon.Abbreviations for mode of delivery are CS, Cesarean section; V, vaginal delivery.Feeding refers to enteral nutrition received in the week prior to sample collection, and the abbreviations for feeding are: BM, breast milk; FF, formula feed; C, combination breast and formula; NPO, no feeds.Perinatal antibiotics refers to the initial course of antibiotics consecutively administered to the baby after delivery. Abbreviations for antibiotics: A, ampicillin; G, gentamycin; V, vancomycin, Cl, clindamycin; Cf, cefotaxime.Preoperative antibiotic days refer to the number of consecutive days on which antibiotics were administered immediately preceding sample collection. This excludes antibiotics administered at time of surgery.Clinical characteristics of infants in this study.标签中附带的字母用于标识匹配样本；例如，样本11A、11B与11C均源自同一婴儿。未知数据以缩写UNK表示；NA为不适用（not applicable）；DOL指出生后天数（day of life）。 组织类型缩写如下：J为空肠（jejunum），I为回肠（ileum），C为盲肠（cecum），RC为右半结肠（right colon），TC为横结肠（transverse colon），LC为左半结肠（left colon）。 分娩方式缩写如下：CS为剖宫产（Cesarean section），V为阴道分娩（vaginal delivery）。 喂养状态指样本采集前一周内接受的肠内营养情况，相关缩写为：BM为母乳（breast milk），FF为配方奶喂养（formula feed），C为母乳与配方奶混合喂养（combination breast and formula），NPO为禁食（no feeds）。 围产期抗生素指分娩后连续给予婴儿的首个疗程抗生素。抗生素相关缩写如下：A为氨苄西林（ampicillin），G为庆大霉素（gentamycin），V为万古霉素（vancomycin），Cl为克林霉素（clindamycin），Cf为头孢噻肟（cefotaxime）。 术前抗生素使用天数指样本采集前即刻连续使用抗生素的天数，本统计不包含手术期间给予的抗生素。 本研究纳入婴儿的临床特征。