Summary Swarming is a type of social motility allowing the migration of highly differentiated bacterial cells. Swarming shares many similarities with biofilm communities, which are notable for their high resistance to antimicrobial agents. We investigate here if the swarming behaviour could also be associated with a widespread antimicrobial resistant phenotype. Challenged with 13 antibiotics from various classes, swarm cells of Pseudomonas aeruginosa , Escherichia coli , Serratia marcescens , Burkholderia thailandensis and Bacillus subtilis showed higher resistance than their planktonic counterparts to all the antibiotics tested, except for the antimicrobial peptides. Using P. aeruginosa as a model, this multiresistant phenotype was shown to be transient and intrinsically linked to the swarming state. Resistance of swarm cells towards other antimicrobial agents, such as triclosan and a heavy metal (arsenite)
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