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Porcine extraintestinal pathogenic Escherichia coli (ExPEC) is occurring with increasing frequency in China, which causes acute septicemia and sudden death in pigs leading to significant economic losses. Bacterial survival and even proliferation within host bloodstream are a common manifestation of a number of bacterial septicemias, including porcine ExPEC diseases. However, the underlying pathogenesis for this novel pathotype of ExPEC has not been explored deeply. Here, we used a conjunction with transposon mutagenesis to identify the