FIG 1.

Infection of P. aeruginosa by bacteriophage inhibits motility and induces repulsion of healthy swarms. (A) Schematic depicting the release of rhamnolipids (RLs) and HAAs (arrows) during swarming (left) and the regulation of rhamnolipids, HAAs, HHQ, and PQS by stress and QS (right). (B to D) Swarm agar assays after 16 to 18 h of growth at 37°C. Wild-type (WT) P. aeruginosa strain PA14 without phage (i) or with phage (ii) or the ΔrhlAB strain without phage (iii) was spotted at the center (B), on the right (C), or at concentric satellite positions surrounding the center (D). Wild-type P. aeruginosa without phage is spotted on the left in panel C and at the center in panel D. Graphics below the images indicate the initial spot positions and corresponding cultures. Petri dishes are 9 cm in diameter.