Table 1.

Virulence factors in Escherichia coli isolated from fecal samples collected from dairy calves (n = 67) with 0 to 67 days of age, number of calves infected with and without diarrhea, and mean age, age range, and confidence interval, measured in days. Martinho Campos, Brazil (2008)

Virulence factors	Fecal consistency	Number of calves	Mean age	Age range	Confidence interval (95 %)
Intimin (eae)	Diarrhea	2	31	26–36	21.2–40.8
	Normal	5	26.8	5–64	6.3–47.3
K99/STa	Diarrhea	4	14.2	1–30	5.0–23.37
	Normal	2	14.5	4–25	0–35.1
Stx1	Diarrhea	4	14.75	14–17	13.3–16.2
	Normal	3	48.33	41–56	39.9–56.7
Stx1/eae	Diarrhea	11	17.38	8–34	12.8–21.9
	Normal	20	26.69	1–62	19.8–33.5
Stx1/Stx2/eae	Diarrhea	2	30	25–35	20.2–39.8
	Normal	0	0	0	0
Stx2	Diarrhea	10	24.41	8–39	18.7–30.1
	Normal	24	39.7	9–63	35.0–44.3
Stx2/eae	Diarrhea	0	0	0	0
	Normal	1	47	47	–