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Acid-suppression drugs (ACDs) are widely used in SAP patients in Asian countries. However, the impact of ACDs on duodenal microbiota during the early phase of SAP is still unknown. This randomized controlled clinical trial evaluated the impacts of esomeprazole (Eso), one of ACDs on duodenal microbiota during the first week of SAP with duodenal aspirates culture and 16sRNA Illumina sequencing analysis. 66 patients were randomized as 1:1 ratio into Eso group (Eso 40\u00a0mg\/day) and Eso-N group (no Eso). The occurrence of duodenal bacterial overgrowth (DBO) was significantly higher in Eso group (about 85%) than that in Eso-N group (about 42%). The duodenal microbiota of the SAP patients shifted away from that of the normal control. There were differences between the Eso-N and Eso groups including enriched abundances of the class Negativicutes, order Selenomonadales and genus\n                    <jats:italic>Veillonella<\/jats:italic>\n                    . Acid suppression significantly increased incidence of Candida oesophagitis (CE) by 8-folds but did not increase other infectious events. In conclusion, acid suppression greatly increased the occurrence of DBO, duodenal dysbiosis and CE during the first week of SAP. Restrictive use of acid-suppressing medications might be helpful to reduce CE and potential risk of pancreatic infection in SAP patients.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Trial registration<\/jats:bold>\n                    : Chictr.org, ChiCTR-IPR-16008301, Registered April 18 2016,\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"http:\/\/www.chictr.org.cn\/showproj.aspx?proj=14089\">http:\/\/www.chictr.org.cn\/showproj.aspx?proj=14089<\/jats:ext-link>\n                    .\n                  <\/jats:p>","DOI":"10.1038\/s41598-020-77245-1","type":"journal-article","created":{"date-parts":[[2020,11,18]],"date-time":"2020-11-18T06:05:54Z","timestamp":1605679554000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["The impacts of acid suppression on duodenal microbiota during the early phase of severe acute pancreatitis"],"prefix":"10.1038","volume":"10","author":[{"given":"Xiao","family":"Ma","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Libin","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyin","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinsun","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chong","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huan","family":"Tong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhe","family":"Feng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinhang","family":"Gao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingguang","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinghua","family":"Tan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ling","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengwei","family":"Tang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,11,18]]},"reference":[{"key":"77245_CR1","doi-asserted-by":"publisher","first-page":"1972","DOI":"10.1056\/NEJMra1505202","volume":"375","author":"CE Forsmark","year":"2016","unstructured":"Forsmark, C. 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