TABLE 1.

Pseudomonas aeruginosa strains used in this study

Strain	Description	Reference(s)
PAO1	Wild-type strain used for mutational analysis in this and previous studies; originally isolated from a human wound in 1955 in Australia	75
ΔprrF1,2 mutant	Deletion mutant of entire prrF locus in PAO1	32
PAO1/pVLT31	Wild-type PAO1 strain carrying the pVLT31 broad-host-range vector (Tcr)	33
ΔprrF1,2/pVLT31 mutant	ΔprrF1,2 mutant carrying the pVLT31 broad-host-range vector (Tcr)	33
ΔprrF1,2/pVLT-prrF1,2 mutant	ΔprrF1,2 mutant carrying the prrF1,2 complementation construct (Tcr)	32
PA14	Clinical isolate from 1995 at the Massachusetts General Hospital, Boston, MA; virulent in a variety of plant and animal models of infection	56
FRD1	Mucoid clinical isolate in a sputum sample from a cystic fibrosis patient	57
WR5	Clinical isolate from a burn patient at Walter Reed Army Hospital, Washington, DC, in 1976; natural toxA mutant isolate; virulent in exptl mouse models	54, 55