TABLE 2.

Efficiencies of plating

Bacterial strain	Relevant characteristics	Relative plating efficiency at 30°Ca of phage strainb:
		φA1122	E6	E11	K18	T3	T7	T71.2YN28
A1122	Y. pestis reference strain	1	1.0	1.0	0.7	<10−8	7 × 10−7	NDc
IJ511	E. coli K-12 reference strain	5 × 10−5	1.0	1.0	1.0	1.0	1.0	1
IJ511/Flac	Pif+	ND	5 × 10−7	2 × 10−7	4 × 10−7	1.0	<10−10	2 × 10−6
IJ531	IJ511 optA1 tonA2	ND	1.0	1.1	1.2	1.0	1.1	1.2
B	E. coli B prototroph	4 × 10−8	0.8	1.3	0.8	0.9	0.8	0.8
BL2	E. coli B lig	ND	1.5	0.8	1.0	1.0	0.9	0.8
BR3	E. coli B rpoC-E2258K	ND	6 × 10−6	5 × 10−6	4 × 10−6	0.8	0.7	0.9
BL21	E. coli B Gal−hsdS	10−6	1.3	1.3	1.0	1.0	1.1	1.1
D2371-48	S. sonnei	ND	<10−10	<10−10	<10−10	0.7	3 × 10−7	ND

^aExpressed relative to A1122 for φA1122 and relative to IJ511 for φA1122 host range mutants and both T3 and T7.

^bThe tail fiber protein of the host range mutant phage E6 contains residues 1 to 130 from T7, E11 contains T7 residues 118 to 125, and K18 is a spontaneous host range mutant containing the gp17-L523S change.

^cND, not determined.