TABLE 2.

Statistical analyses of C. elegans kill assays^a

Strain	LT50b	P valuec (MG1655)	P valued (E2348/69)
MG1655	247 ± 16		0.03*
E2348/69	161 ± 34	0.03*
JPN15	150 ± 15	0.03*	0.6
CVD452	149 ± 26	0.006*	0.7
SE796	175 ± 40	0.06	0.3
B171-8	185 ± 9	0.02*	0.5
B171-8ΔA	181 ± 33	0.1	0.7
TB135A	161 ± 46	0.07	0.95
TB156A	157 ± 36	0.1	0.9

^aNematodes were subjected to infection with EPEC and control bacteria on NGM agar at 26°C, and survival was monitored as described in Materials and Methods.

^bMean LT₅₀ values from at least three replicate assays using 12 nematodes each are presented in mean hours ± 1 SD.

^cObtained by paired t test comparing LT₅₀ values with those obtained for control strain MG1655. Asterisks indicate P values of <0.05.

^dObtained by paired t test comparing LT₅₀ values with those obtained for prototypical EPEC strain E2348/69. Asterisks indicate P values of <0.05.