Table 2.

Summary statistics of the numbers of presumptive E. coli organisms isolated from different animal species from CHROMagar ECC and CHROMagar CTX agar medium

Statistic	No. of E. coli organisms (CFU/g) isolated from:
	Cattle feces (n = 35)		Chicken cecal contents (n = 32)		Pig feces (n = 20)
	ECCa	CTXb	ECC	CTX	ECC	CTX
Minimum	6 × 104	100	8 × 104	100	1 × 106	100
25th percentile	9 × 105	100	4.2 × 106	250	3 × 106	100
Mean	2.8 × 108	8.6 × 104	1.2 × 108	2.1 × 105	1.1 × 107	1.0 × 105
Median	1.8 × 106	100	3.5 × 107	5,350	7.5 × 106	2,800
75th percentile	7 × 106	1,000	8.05 × 107	1.75 × 105	1 × 107	1.95 × 105
Maximum	4.9 × 109	1 × 106	1 × 109	3.1 × 106	4.4 × 107	4.7 × 105
SD	1.1 × 109	2.8 × 105	2.5 × 108	5.7 × 105	1.2 × 107	1.6 × 105

^aECC, CHROMagar ECC.

^bCTX, CHROMagar CTX.