TABLE 2.

Percentage of wells (n = 16 for each strain and each dilution) allowing growth (turbidity) of five strains of K. pneumoniae in the presence of increasing concentrations of chlorhexidinea

Concn of chlorhexidine (%, 102 [vol/vol])% Of wells with growth of indicated K. pneumoniae serotype
B5055B5055nmK54K1K2
0.049100100100100100
0.098100100100100100
0.1950694506
0.3900600
0.7800000
1.5600000
  • a K54 grew in 15 of the 16 wells at a chlorhexidine concentration of 0.0019% (B5055 and K1 grew in 8 wells and B5055nm and K2 grew in 2 wells at 0.0019%, none of these four grew at 0.0039%). K54 tended to survive better than the other strains in the presence of chlorhexidine, but this was not significantly different from the other four strains.