FIG. 5.

Effect of quorum sensing on V. cholerae survival in an extreme environment. Biofilm-associated and planktonic wild-type C6706 cells and quorum-sensing-deficient mutant hapR cells were exposed to 4°C seawater. The number of CFU was determined after 5 days of incubation and represented as the percentage of the initial CFU. The values are means ± standard deviations (error bars). The results are representative of three experiments. Values that are significantly different from the wild-type value by the Student t test are indicated by asterisks (**, P < 0.05; *, P < 0.5).