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Most swarm-negative isolates do not produce wetting material. Wild-type PAO1 was inoculated in the centre of the swarming plate. The black arrow shows a swarm-negative clinical isolate that does not produce wetting material and does not repel PAO1, while the white arrow shows PAO1 avoiding a swarm-negative clinical isolate due to the production of wetting material. Bar, 2 cm.
