Table 1. Median lethal doses of parental and ∆yrpA strains of Y. ruckeri.

		LD50 (CFU) 95% confidence limit
Bacterial strain	LD50 (CFU)a	Lower	Upper
Parental strain 150	1.73 × 102	0.18 × 102	6.78 × 102
∆yrpA	7.1 × 104	5.7 × 103	3.9 × 106

^a LD₅₀ values were determined from data involving groups of 10 fish for each dilution containing between 10 and 10⁷ CFU.