Table 2.

The prevalence (with exact ±95% confidence intervals) of animal and herd-level seropositivity for Brucella by production system (May 2003–January 2004).

	Herd-level		Animal-level
Production system	Number positives	Seroprevalence, % (± 95% CI)	Number positives	Seroprevalence,% (± 95%CI)
Traditional	5	20.0 (13.8–26.2)	18	7.3 (3.1–12.0)
Smallholder dairy	11	10.5 (8.2–11.8)	17	4.1 (1.9–7.6)
Overall	16	12.3 (10.1–13.9)	35	5.3 (3.1–7.8)

CI: lower and upper limits for 95 percent confidence interval of the seroprevalence.