Table 2.

LD₅₀ of the three multidrug resistant strains on 2 days old chickens.

Infection route	Strains	Infection dose of (CFU)	Number of chickens	Number of Dead chicken	LD50
Oral infection	1442	3.70 × 107	7	0	NA
		3.70 × 106	7	0
		3.70 × 105	7	0
		0	7	0
	1622	3.70 × 107	7	2	NA
		3.70 × 106	7	0
		3.70 × 105	7	0
		0	7	0
	1655	3.70 × 107	7	4	8.45 × 107
		3.70 × 106	7	1
		3.70 × 105	7	1
		0	7	0
Intraperitoneal infection	1442	3.70 × 107	7	2	NA
		3.70 × 106	7	1
		3.70 × 105	7	0
		0	7	0
	1622	3.70 × 107	7	1	NA
		3.70 × 106	7	1
		3.70 × 105	7	0
		0	7	0
	1655	3.70 × 107	7	7	<3.70 × 105
		3.70 × 106	7	7
		3.70 × 105	7	7
		0	7	0