Abstract
BackgroundSalmonella Derby is one of the most predominant Salmonella serotypes that seriously threatens food safety. This bacterium can be further differentiated to sub-populations with different population sizes; however, whether and how the S. Derby–gut microbiota interactions affect epidemic patterns of S. Derby sub-populations remain largely unknown.ResultsWe selected two representative strains, 14T and 14C, which represent rarely distributed and prevalent sub-populations of the S. Derby ST40 group, respectively, to address this question using a mouse model. Effects of oral administration of both strains was monitored for 14 days. Alpha diversity of gut microbiota at early stages of infection (4 h post infection) was higher in 14C-treated mice and lower in 14T-treated mice compared with controls. Strain 14T triggered stronger inflammation responses but with lower pathogen titer in spleen compared with strain 14C at 14 days post infection. Certain known probiotic bacteria that can hinder colonization of Salmonella, such as Bifidobacteriaceae and Akkermansiaceae, exhibited increased relative abundance in 14T-treated mice compared with 14C-treated mice. Our results also demonstrated that Ligilactobacillus strains isolated from gut microbiota showed stronger antagonistic activity against strain 14T compared with strain 14C.ConclusionsWe identified how S. Derby infection affected gut microbiota composition, and found that the 14T strain, which represented a rarely distributed S. Derby sub-population, triggered stronger host inflammation responses and gut microbiota disturbance compared with the 14C strain, which represented a prevalent S. Derby sub-population. This study provides novel insights on the impacts of gut microbiota on the epidemic patterns of Salmonella populations.
Highlights
Salmonella Derby is one of the most predominant Salmonella serotypes that seriously threatens food safety
Recent studies have demonstrated that strains affiliated with the same Salmonella serotype can exhibit distinct inter-strain variations on epidemic prevalence, pathogenicity, and risk to food safety, etc. [11,12,13,14,15]
No significant community structure difference was observed among the three groups at 14 dpi (PERMANOVA, p > 0.05) (Additional file 1: Figure S3). These results suggested that 14C administration did not altered overall structure of the gut microbiota during the infection course, while the community structure was significantly altered by the 14T strain shortly after administrated, and the influence of 14T on the overall microbial community was mostly eliminated at 14 dpi
Summary
Salmonella Derby is one of the most predominant Salmonella serotypes that seriously threatens food safety. This bacterium can be further differentiated to sub-populations with different population sizes; whether and how the S. Little is known about how other Salmonella serotypes interact with gut microbiota and the consequences of the interactions on the epidemic of the pathogens, many serotypes have caused dramatic economical losses and threatened food safety and public health. Recent studies have demonstrated that strains affiliated with the same Salmonella serotype can exhibit distinct inter-strain variations on epidemic prevalence, pathogenicity, and risk to food safety, etc.
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