Table 1.

Salt resistance of wild-type and mutant L. pneumophila strains

Strain Mean % NaCl-resistant CFUa ± SD
Wild type0.01 ± 0.003
Salt-resistant110.0b ± 14
STM-10.06 ± 0.01
STM-20.005 ± 0.002
STM-30.002 ± 0.0006
STM-40.8b ± 0.1
STM-50.05 ± 0.03
STM-674.0b ± 17
  • a Percent NaCl-resistant CFU was determined for strains grown to post-exponential phase with the following formula: (CFU on BCYEα-MOPS plus 125 mM NaCl/CFU on BCYEα-MOPS) ×100.

  • b Statistically different from wild type (P < 0.05) .