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This template was adapted from the original submission. Edits were made to enhance scientific accuracy, optimal usability and/or to meet industry-leading design standards for science communication. Gut microbiota provides resistance to bacterial invasion (1), which can be lost under different perturbations, such as antibiotic treatment. The keystone microbiota member Klebsiella michiganensis was shown to be sufficient to provide colonization resistance against Enterobacteriaceae species, such as Escherichia coli and Salmonella (2). The higher nutrient consumption capacity of K. michiganensis enables it to efficiently conquer more nutrient niches, outcompeting E. coli from the gut (3).