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Abstract Plasmid coexistence is widespread in multidrug-resistant Escherichia coli, yet the mechanisms maintaining co-resident resistance plasmids remain unclear. Here, we show that an mcr-1-bearing IncI2 plasmid promotes persistence of a co-resident MDR IncFII plasmid by coordinating plasmid replication and physiology. Genomic analysis revealed recurrent co-detection of IncI2 and IncFII plasmids, whereas conjugation assays showed that this pattern was not explained by enhanced basal transfer.
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