Table 6.

Sample size for random sampling to detect sheep and goat pox virus infection with 95% confidence based on different values of infection prevalence (median values) at 7, 14, 21, 28 days after virus introduction into the herd for testing by PCR (Se: 100%%, Sp: 100%), for different scenarios of mortality and herd sizes

Days post introduction	Scenario	Herd size
		50	100	1,000
7	Low mortality	48	96	951
	High mortality	39	96	777
14	Low mortality	32	53	632
	High mortality	22	53	348
21	Low mortality	19	35	348
	High mortality	9	18	101
28	Low mortality	13	20	170
	High mortality	5	7	31