Table 2.

The mean, median, and range for the number of days post-challenge until the onset of fecal shedding, the number of days duration of fecal shedding post-challenge, and the number of days post-challenge until the cessation of fecal shedding, in calves experimentally challenged with 25, 50, 100, 500, 1 × 10³, 1 × 10⁴, 1 × 10⁵, or 1 × 10⁶ oocysts of C. parvum.

Dose of C. parvum oocysts	25	50	100	500	1000	10,000	100,000	1,000,000
Onset of fecal oocyst shedding (days)
Mean	7.3	8.8	5.7	5.3	4.7	4.7	5	2.7
Median	7	9	6	5	4	4	5	3
Range	(7–8)	(7–10)	(5–6)	(5–6)	(4–6)	(4–5)	(4–6)	(2–3)
Duration of fecal oocyst shedding (days)
Mean	11	9.5	11.7	9.7	10.7	13.3	10.7	13
Median	11	9	12	9	11	13	9	12
Range	–	(9–11)	(11–12)	(8–12)	(9–12)	(13–14)	(8–15)	(9–18)
Cessation of fecal oocyst shedding (days)
Mean	18	18.3	17.3	15.3	15.3	18	15.7	15.7
Median	18	18.5	18	15	15	18	14	14
Range	(17–19)	(16–20)	(16–18)	(14–17)	(15–16)	(17–19)	(14–19)	(12–21)