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Riemerella anatipestifer (RA) causes major economic losses to the duck industry. Autoinducer-2 (AI-2) is a quorum-sensing signal that regulates bacterial physiology. The luxS and pfs genes are required for AI-2 synthesis in many bacterial species. pfs encodes Pfs, which functions upstream of LuxS in the biosynthesis of AI-2. In this study, we investigated the AI-2 activity of RA using an AI-2 bioassay,...
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