Bacillus pumilus SMU5927 protect mice from damage caused by Salmonella Enteritidis colonization.

Abstract

BACKGROUND: Salmonella Enteritidis is one of the main pathogens of foodborne diseases and an important pathogen causing diarrhea in yaks. Antibiotics are the mainstay of treatment for salmonellosis, but the widespread use of antibiotics has increased Salmonella resistance. Probiotics have been shown to antagonize Salmonella and reduce Salmonella infection. Bacillus pumilus is one of the microbial feed additives approved by the Chinese Ministry of Agriculture for use in animal breeding, which has the effect of improving animal growth performance and immunity, among others. Therefore, this paper explored the anti-infective effect of Bacillus pumilus against Salmonella. RESULTS: Bacillus pumilus SMU5927 significantly enhances the intestinal mechanical barrier and reduces the number of Salmonella transferred to the organs. Bacillus pumilus SMU5927 ameliorated intestinal tissue damage and attenuated intestinal inflammatory responses in mice. In addition, Bacillus pumilus increased the ratio of the Firmicutes/Bacteroidetes in the intestinal flora, increased the abundance of beneficial bacteria such as Lactobacillus, and decreased the abundance of harmful bacteria. CONCLUSION: This study confirmed the role of Bacillus pumilus SMU5927 in preventing and attenuating Salmonella damage and provided ideas for the development of novel antimicrobial drugs.