Table 1.

Bacteriophage plating efficiency^a

	Bacteriophage
Bacterial strain	R17	M13
X90 ΔtolA	0.93 ± 0.12	0.0b
X90 ΔtonB	1.2 ± 0.26	1.0 ± 0.20
X90 ΔtolA ΔtonB	1.1 ± 0.15	0.0b
X90 ΔtraA::cat pTrc	0.0b	0.0b
X90 ΔtraA::cat pTrc::traA	1.2 ± 0.18	1.2 ± 0.15
X90 ΔtraA::cat pTrc::traA(D74G)	0.0b	1.1 ± 0.09
X90 ΔtraA::cat pTrc::traA(G120C)	0.09 ± 0.005c	0.77 ± 0.06c
X90 ΔtrbI::cat	0.1 ± 0.04c	0.1 ± 0.03c

^aThe indicated bacterial strains were infected with 10 and 100 plaque forming units (pfu). The number of plaques for each strain was divided by the plaques obtained with wild-type X90 cells. The mean plating efficiency ± SEM is reported (n = 4).

^bNo plaques were detected when bacteria were incubated with 10³ pfu of phage.

^cPlaques were turbid.