ReviewEuropean journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology2026
Microbial profiles in pediatric complicated appendicitis: a systematic review and meta-analysis.
Review in European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
5 authors.
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Abstract
purposeAppendicitis, characterized by inflammation of the vermiform appendix, remains the leading cause of acute abdomen worldwide. Emerging evidence suggests that alterations in the intestinal microbiota may play a role in its pathogenesis. This study aimed to analyze the prevalence and microbiological profile of bacteria identified in pediatric patients with complicated acute appendicitis.
methodsA systematic review was conducted, including studies published up to April 2026 within a 12-year timeframe. Twenty-three observational cohort studies met the inclusion criteria and were included in the qualitative synthesis. Among these, studies reporting patient-level prevalence and using culture-based methods were included in the quantitative analysis.
resultsThe findings demonstrated that Escherichia coli was the most frequently identified microorganism in pediatric complicated appendicitis. Other commonly detected bacteria included Streptococcus spp., Bacteroides spp., Pseudomonas spp., Enterococcus spp., and Klebsiella spp. However, the certainty of the evidence for these findings remains low. Substantial methodological heterogeneity was observed across studies, particularly regarding sample collection, microbiological techniques, and outcome reporting, which limits the comparability and generalizability of the results.
conclusionIn conclusion, while Escherichia coli appears to predominate in pediatric complicated acute appendicitis, the available evidence is limited and should be interpreted with caution. Future well-designed multicenter studies using standardized protocols are essential to improve the consistency of findings and strengthen the overall evidence base.
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