Table 2.

Number of days with oocyst excretion, mean OPG based on daily faecal samples (1–28 dpi) and number of oocysts shed (sum of the daily OPG per calf) on days 1–28 postinfection for each calf of the prophylactic, the therapeutic and the control group.

	Animal number	Number of days with oocyst excretion	Mean OPG excreted	Number of oocysts shed
Prophylactic group	4a	24	0.4 × 106	12.8 × 106
	5	9	0.2 × 106	7.4 × 106
	6	9	0.2 × 106	5.4 × 106
	Mean (S.D.)	14 (8.7)	0.3 × 106 (0.12 × 106)	8.5 × 106 (3.8 × 106)
Therapeutic group	7	5	0.02 × 106	0.7 × 106
	8	11	0.07 × 106	2.7 × 106
	9	9	0.05 × 106	2.1 × 106
	Mean (S.D.)	8.3 (3.1)	0.06 × 106b (0.03 × 106)	1.9 × 106b (1.0 × 106)
Control group	10a	17	0.4 × 106	11.7 × 106
	11	9	0.2 × 106	8.7 × 106
	12	15	0.1 × 106	3.6 × 106
	Mean (S.D.)	13.6 (4.2)	0.3 × 106 (0.14 × 106)	8.0 × 106 (4.1 × 106)

^aChronic carrier.

^bp < 0.05: maximum likelihood estimate based on negative binomial distribution.