Table 1.

Strains used in this study.

Species	Strain	Reference
C. elegans	glp-4(bn2)	Beanan and Strome, 1992
E. coli	OP50	Stiernagle, 2006
P. aeruginosa	PA14	Rahme et al., 1995
P. aeruginosa	PA14ΔpvdA	Shanks et al., 2006; Kuchma et al., 2007
P. aeruginosa	PAO1	Holloway et al., 1994
P. aeruginosa	Boston 41501	ATCC 27853 (Medeiros et al., 1971)
P. aeruginosa	KM 306	ATCC 25010 (Yabuuchi and Ohyama, 1972)
P. aeruginosa	6092	ATCC 33360 (Liu et al., 1983)
P. fluorescens	WCS365	Geels and Schippers, 1983
E. faecalis	OG1RF	Garsin et al., 2001