Table 5.

LD₅₀ of wild-type, complementation, and atl mutant S. suis 2 strains

Dose	Average mortality
	HA9801	HA9801 Δatl complement strain	HA9801 Δatl mutant
2.0 × 107 CFU/fish	15/15	15/15	15/15
2.0 × 106 CFU/fish	13/15	12/15	10/15
2.0 × 105 CFU/fish	9/15	8/15	6/15
2.0 × 104 CFU/fish	7/15	6/15	4/15
2.0 × 103 CFU/fish	2/15	0/15	0/15
LD50 CFU/fish	5.28 × 104	1.15 × 105	3.37 × 105