{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T19:54:12Z","timestamp":1780084452437,"version":"3.54.0"},"reference-count":26,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,3,3]],"date-time":"2026-03-03T00:00:00Z","timestamp":1772496000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Background: Vitamin D contributes to intestinal barrier integrity and innate immune regulation, but its role in susceptibility to Salmonella infection and systemic inflammation in hospitalized pediatric patients with acute gastroenteritis (AGE) remains unclear. Methods: We retrospectively analyzed 70 pediatric patients hospitalized with AGE, examining the associations of admission 25(OH)D levels with culture-confirmed Salmonella infection and C-reactive protein (CRP). Multivariable logistic and linear regression models were adjusted for age and sex. Vitamin D status was classified as sufficient (\u226530 ng\/mL), suboptimal (&lt;30 ng\/mL), or deficient (&lt;20 ng\/mL). Results: The median age of the 70 included patients was 3.0 years (IQR: 1.5\u20136.0, range: 1.0\u201317 years), and 55.7% were male. Suboptimal vitamin D status was present in 64.3% of patients and was associated with higher median CRP levels (3.84 vs. 1.42 mg\/dL, p = 0.025) and a greater prevalence of Salmonella infection (48.9% vs. 24.0%, p = 0.047). In multivariable analysis, suboptimal 25(OH)D levels independently marginally predicted an increased odds of Salmonella infection (adjusted odds ratio 3.11, 95% CI 1.00\u20139.67; p = 0.051). Serum 25(OH)D levels were inversely associated with natural log-transformed CRP (p = 0.026), with each 1 ng\/mL increase corresponding to an estimated 5% reduction in CRP. Furthermore, vitamin D deficiency (&lt;20 ng\/mL) was associated with a 3.5-fold increase in CRP compared to levels \u2265 20 ng\/mL (p = 0.012). Conclusions: Suboptimal vitamin D status (&lt;30 ng\/mL) may be associated with increased susceptibility to Salmonella gastroenteritis, while deficiency (&lt;20 ng\/mL) correlates with exacerbated inflammatory burden in hospitalized pediatric patients. These findings suggest a threshold-dependent effect of vitamin D on both mucosal defense and systemic inflammation. Prospective trials are warranted to evaluate the therapeutic potential of vitamin D supplementation in this population.<\/jats:p>","DOI":"10.3390\/nu18050827","type":"journal-article","created":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T16:17:31Z","timestamp":1772641051000},"page":"827","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Suboptimal Vitamin D Status Is Associated with Salmonella Infection and Elevated C-Reactive Protein in Hospitalized Children with Acute Gastroenteritis: A Retrospective Cohort Study"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1760-5298","authenticated-orcid":false,"given":"Hua-Hsi","family":"Hung","sequence":"first","affiliation":[{"name":"Department of Pediatric Gastroenterology, Hepatology and Nutrition, MacKay Children\u2019s Hospital, Taipei 104217, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hung-Chang","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology, Hepatology and Nutrition, MacKay Children\u2019s Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medical Research, MacKay Memorial Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medicine, MacKay Medical University, New Taipei City 252005, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun-Yan","family":"Yeung","sequence":"additional","affiliation":[{"name":"Department of Medical Research, MacKay Memorial Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medicine, MacKay Medical University, New Taipei City 252005, Taiwan"},{"name":"Department of Pediatric Gastroenterology, Hepatology and Nutrition, Hsinchu Municipal MacKay Children\u2019s Hospital, Hsinchu City 300044, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9740-800X","authenticated-orcid":false,"given":"Wai-Tao","family":"Chan","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology, Hepatology and Nutrition, MacKay Children\u2019s Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medical Research, MacKay Memorial Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medicine, MacKay Medical University, New Taipei City 252005, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Szu-Wen","family":"Chang","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology, Hepatology and Nutrition, MacKay Children\u2019s Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medical Research, MacKay Memorial Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medicine, MacKay Medical University, New Taipei City 252005, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fang-Ju","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Medical Research, MacKay Memorial Hospital, Taipei 104217, Taiwan"},{"name":"Center for General Education, MacKay Junior College of Medicine, Nursing, and Management, Taipei 112021, Taiwan"},{"name":"Institute of Biomedical Informatics, National Yang Ming Chiao Tung University, Taipei 112304, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2763-3476","authenticated-orcid":false,"given":"Chuen-Bin","family":"Jiang","sequence":"additional","affiliation":[{"name":"Department of Pediatric Gastroenterology, Hepatology and Nutrition, MacKay Children\u2019s Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medical Research, MacKay Memorial Hospital, Taipei 104217, Taiwan"},{"name":"Department of Medicine, MacKay Medical University, New Taipei City 252005, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,3]]},"reference":[{"key":"ref_1","first-page":"236","article-title":"The Global Burden of Diarrhoeal Disease in Children","volume":"81","author":"Parashar","year":"2003","journal-title":"Bull. 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