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We build a stochastic microscopic model for the pili-driven motility of bacteria that interact with trails which could be laid by themselves and others. We discuss its phenomenology both at the level of single bacterium dynamics and collective self-organization into colonies. We validate the model using Pseudomonas aeruginosa trajectories, and show that fitting the parameters at the single bacterium level leads to a good quantitative agreement between the predictions of the model for the collective behaviour of the colony and the corresponding experimental observations.
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