Nature Reviews Microbiology 6, 257 (2008)

In this In Brief, we incorrectly stated that switching EPS production off at high cell density allows bacteria such as Pseudomonas aeruginosa to compete better in environments in which local competition is prolonged and intense, such as chronic infections. We should have stated that P. aeruginosa switches EPS production on at high cell density. We apologize to our readers for any confusion caused.