Table 2. Adherence to and invasion of A549 cells by strains C50041 and ΔspiA.

Values are mean±sd.

Strain	Growth phase	Percentage adherence (no. adhered/no. inoculated)	Percentage invasion (no. invaded/no. inoculated)
C50041	Exponential	0.40±0.20	0.40±0.01
ΔspiA		0.59±0.09	0.63±0.13
C50041	Biofilm	25.7±2.2	3.5±0.01
ΔspiA		25.5±4.2	3.7±0.50