The antibiotic tobramycin kills outer layers of Pseudomonas aeruginosa biofilms (top, red) but leaves a colony (in green) behind to re-seed an infection. (sciencemag.org)
They set up a panel of S. aureus cultures, exposed them to molecules secreted by 14 different P. aeruginosa strains, and then tested the susceptibility of each culture to one of three antibiotics: vancomycin, tobramycin, and ciprofloxacin. (sciencedaily.com)
Some strains of P. aeruginosa, as expected, significantly reduced S. aureus's susceptibility to tobramycin and ciprofloxacin. (sciencedaily.com)