Fig 1. Effect of free chlorine 0.2 mg L^-1 and 0.5 mg L^-1, on the inactivation of 5 Legionella strains.

Bacterial inactivation was determined using viable counts on BCYE agar medium. Data are presented as means ± SD (columns and error bars; n = 3). Statistical differences between means within each time point were represented assigning different letters to the bar plot. The same letter was assigned to bars with no significant differences between them. Statistical analyses were performed by ANOVA and pairwise Fisher’s LSD test (p<0.05).