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• W3119189735 abstract "The contamination of Salmonella Enteritidis in eggs and chicken meat via vertical transmission has become a worldwide public health concern. Biofilm formation by S . Enteritidis further enhances its antibacterial resistance. However, whether genes related to biofilm formation affect the level of vertical transmission is still unclear. Here, S . Enteritidis mutants Δ csgD , Δ csgA , Δ bcsA , and Δ adrA were constructed from wild type strain C50041 (WT), and their biofilm-forming ability was determined by Crystal violet staining assay. Then the median lethal dose (LD 50 ) assay was performed to determine the effects of the selected genes on virulence. The bacterial load in eggs produced by infected laying hens via the intraperitoneal pathway or crop gavage was determined for evaluation of the vertical transmission. Crystal violet staining assay revealed that S . Enteritidis mutants Δ csgD , Δ csgA , and Δ bcsA , but not Δ adrA , impaired biofilm formation compared with WT strain. Furthermore, the LD 50 in SPF chickens showed that both the Δ csgD and Δ bcsA mutants were less virulent compared with WT strain. Among the intraperitoneally infected laying hens, the WT strain-infected group had the highest percentage of bacteria-positive eggs (24.7%), followed by the Δ adrA group (16%), Δ csgA group (9.9%), Δ bcsA group (4.5%), and Δ csgD group (2.1%). Similarly, among the crop gavage chickens, the WT strain group also had the highest infection percentage in eggs (10.4%), followed by the Δ csgA group (8.5%), Δ adrA group (7.5%), Δ bcsA group (1.9%), and Δ csgD group (1.0%). Our results indicate that the genes csgD and bcsA help vertical transmission of S . Enteritidis in chickens." @default.
• W3119189735 created "2021-01-18" @default.
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• W3119189735 date "2021-01-14" @default.
• W3119189735 modified "2023-10-18" @default.
• W3119189735 title "Biofilm-Formation-Related Genes csgD and bcsA Promote the Vertical Transmission of Salmonella Enteritidis in Chicken" @default.
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• W3119189735 doi "https://doi.org/10.3389/fvets.2020.625049" @default.
• W3119189735 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7840958" @default.
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