IntroductionPrevious studies and society guidelines have proposed probiotics as a complementary therapy for acute infectious diarrhea, which may shorten the disease course, yet strain-specific effects and microbiome correlates remain incompletely defined. We aim to evaluate the effect of a combination of Lactobacillus acidophilus and Limosilactobacillus reuteri on the duration of diarrhea and gut microbiota composition in children with acute infectious diarrhea.Patient and methodsIn a prospectiv