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Viable counts of planktonic bacteria in the biofilm assay over time (0, 12, 14, 20, and 24 weeks). Francisella strains were incubated in 0.9% NaCl at 20°C and 4°C. Columns show means for six replicates (except those for FSC200 and the LVS at 24 weeks, which show means for three replicates), and error bars represent standard deviations. Absence of bars indicates no CFU.
