TABLE 1.

Mortality rates among chick embryos inoculated with APEC and NMEC isolates compared using Fisher's exact test^d

Strain	Mortality ratec	P value vsa:
		DH5α	APEC O2
Uninoculated	0/6	1.000	<0.001
PBS	3/10	0.300	0.001
E. coli DH5α	2/20		<0.001
APEC 79	7/20	0.127	<0.001
APEC 353	12/20	0.002	0.064
APEC 358	16/20	<0.001	0.661
APEC 380	16/20	<0.001	0.661
NMEC 15	14/20	<0.001	0.235
NMEC 18	11/20	0.005	0.031
NMEC 38	19/20	<0.001	1.000
NMEC 58	14/20	<0.001	0.235
APEC O2b	32/40	<0.001

^aP value determined by Fisher's exact test for comparing proportions.

^bPositive control for the chicken embryo lethality assay.

^cData represent the number of embryos that died/total number of embryos tested.

^dThis table is reprinted from reference 6 with permission. APEC, avian-pathogenic E. coli; NMEC, neonatal meningitis E. coli.